The document discusses the formation of the Himalayan mountain range through the process of plate tectonics. Approximately 200 million years ago, the supercontinent Pangea broke apart into separate landmasses. Around 80 million years ago, the Indo-Australian plate began moving northward, pushing India towards Eurasia. By around 40 million years ago, India had collided with Asia, causing the Tethys Sea between them to shrink and uplift. The collision forced the Tibetan plateau upwards, creating the Himalayan mountain range. The Himalayas continue rising even today as the Indo-Australian plate still pushes into Eurasia.
Boundary problems between :-
Precambrian/Cambrian
Permian/Triassic
Cretaceous/Tertiary
Neogene/Quaternary
Stratigraphic boundaries are determined by one or more of geological events such as volcanic activity, sedimentation, tectonism, paleo-environments & evolution of life.
Faunal records have played major role in determining the boundaries of the Phanerozoic units.
The other geological events are dated on the evidence of fossil records.
This notes provide the information about tectonic divisions and evolution of Himalayas. movement of Indian plate has also taken up in brief.
Tectonic Division of Himalaya
Evolution of Himalaya
Movement of Indian Plate.
Resource description_ Rasoul Sorkhabi, The himalayan Journal, 2010
Boundary problems between :-
Precambrian/Cambrian
Permian/Triassic
Cretaceous/Tertiary
Neogene/Quaternary
Stratigraphic boundaries are determined by one or more of geological events such as volcanic activity, sedimentation, tectonism, paleo-environments & evolution of life.
Faunal records have played major role in determining the boundaries of the Phanerozoic units.
The other geological events are dated on the evidence of fossil records.
This notes provide the information about tectonic divisions and evolution of Himalayas. movement of Indian plate has also taken up in brief.
Tectonic Division of Himalaya
Evolution of Himalaya
Movement of Indian Plate.
Resource description_ Rasoul Sorkhabi, The himalayan Journal, 2010
this power point will completely inform you about the great northern mountains-HIMALAYAS........how they were formed....description.....composition........age and many other things.....
PHYSICAL DIVISIONS OF INDIA
India may be divided broadly into SIX physical units : –
1) The Great Northern Mountains.
2) The Northern Plains.
3) The Peninsular Plateau.
4) The Desert.
5) The Coastal Plains.
6) The Islands.
World Geography
The rocky ball that forms our world is one of nine planets in the Solar System. Earth is a sphere, with a
slight bulge in the middle at the Equator, and a diameter of 12,756 km (7,926 miles). It hurtles at speeds
of 105,000 kph (65,000 mph) during its orbit around the Sun, turning on its AXIS once every 24 hours.
This journey takes a year to complete. The Earth is the only planet that is known to support life, in a zone
called the BIOSPHERE.
UNIQUE PLANET
Water, oxygen, and energy from the Sun combine on Earth to help create suitable conditions for life.
The planet’s surface is mainly liquid water, which is why it looks blue from space. Earth is the only planet
in the Solar System with an atmosphere that contains a large amount of oxygen. The Sun is 150 million
km (93 million miles) away, producing heat that is bearable on Earth.
ATMOSPHERE
The atmosphere is a layer of gas surrounding the Earth that is some 700 km (400 miles) thick. It is made
up of nitrogen (78 per cent) and oxygen (21 per cent), plus traces of other gases. Tiny droplets of water
vapour form the clouds we see.
OCEANS
Oceans cover 70.8 per cent of the Earth’s surface, to an average depth of 3.5 km (2 miles). The
hydrosphere (watery zone) also includes freshwater rivers and lakes, but these make up less than 1 per
cent of Earth’s water.
LAND
Dry land occupies 29.2 per cent of the Earth’s surface, where the lithosphere (rocky crust) rises above
sea level to form seven continents and countless smaller islands. Land can be categorised into biomes
major habitats such as forests, grasslands, and deserts.
ICE AND SNOW
The cryosphere (frozen zone) includes snow and glaciers on high mountains, sea ice, and the huge ice caps
that cover the landmasses of Greenland and the Antarctic. In the past, during long cold eras called ice
ages, ice covered much more of Earth’s surface than it does today.
EARTH SCIENCE
Meteorology, the study of Earth’s atmosphere, is one of the Earth sciences. Earth scientists study Earth’s
physical characteristics, from raindrops to rivers and the rocks beneath our feet. Other branches of study
include geology (rocks), hydrology, (oceans and freshwater), and ecology (living things and the
environment).
STUDY TECHNIQUES
Satellite images allow scientists to monitor everything from ocean currents to minerals hidden below
ground. Techniques such as radar and sonar have transformed our understanding of our planet. Some
Earth scientists also spend time in the field, which means working outdoors, collecting data and samples
from clouds, cliffs, craters, volcanic lava, and deep-buried ice.
BIOSPHERE
The biosphere is the part of Earth that contains what is needed for living things. This zone extends from
the ocean floor to top of the troposphere (lower atmosphere). Tiny organisms can survive deep in the
Earth’s crust, but most forms of life are found from a few hundred metres below sea level to about 1,000
m (3,300 ft) above sea level.
TH
Chapter - 2, Physical Features of India, Geography, Social Science, Class 9Shivam Parmar
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Chapter - 2, Physical Features of India, Geography, Social Science, Class 9
INTRODUCTION
THEORY OF PLATE TECTONICS
THE HIMALAYAN MOUNTAINS
1. HIMADRI
2. HIMACHAL
3. SHIVALIK
DIVISION OF HIMALAYAS FROM WEST TO EAST
THE NORTHERN PLAIN
THE INDIAN DESERT
THE ISLAND GROUP
Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
By Shivam Parmar (PPT Designer)
REPRODUCTION
Reproduction is the capacity of all living things to give rise to new living things. It includes the transmission of hereditary material from the parent/parents.
The two types of reproduction are:
Asexual Reproduction
Sexual Reproduction
ASEXUAL REPRODUCTION
Is the simplest form of reproduction. Occurs in plants, animals, bacteria, and protists Requires one parent. Is more reliable than sexual reproduction. Doesn’t allow for any type of genetic variation.
TYPES
Sporulation
Fragmentation
Regeneration
Binary Fission
Budding
Vegetative propagation
SPORULATION
Spore is a reproductive cell that produces a new organism.
Spores are unicellular if conditions are right a spore will develop into a new individual.
They can be carried by the wind, water, or animals
FRAGMENTATION
When a organism is broken into more than one part.
Organism must have good regeneration abilities.
Create many new organisms quickly.
REGENERATION
An organism can replace/re-grow an injured or lost part
Regeneration in plants from
Roots
Stem
leaf
Regeneration in animals
For simple organisms
No vertebrates have this power
Examples are starfish and the salamander
BINARY FISSION
One parent dividing into two by mitosis
Offspring are always genetically identical
Cells may stay close together to form filaments or colonies
Examples-Bacteria and Amoebas
BUDDING
Form on part of the parent by growing an outgrowth which then detaches
Example- is Hydra and Yeast
Offspring will always be genetically identical to the parent
VEGETATIVE PROPOGATION
Plant parts make new plant
Reproduction is very quick
Disadvantage: many plants grow close to each other
Bulbs
– Underground stem
– Surrounded by colorless leaves
– Colorless leaves protect the bulb
– The green leaves store the food
Rhizomes
– Underground stem
– They store food for new plant
– At the end of Rhizomes nodes
Runners(strawberries)
– They are above ground.
– Stems – Nodes form at the end of Runners
– They grow outward
Tuber (potatoes)
– Underground stem
– Stores food
– The nodes eat the tuber
– Potatoes have eyes / buds to make new tubers and or reproduce
Grafting
– Surgically connecting two similar plants
– Ex. Apples – Not done naturally
Cutting
– Cutting off a stem or leaf to reproduce a new plant
– Must be in wet or moist area
– Combination of regeneration and fragmentation
– Not done naturally
Cloning
What is cloning?
Cloning is the creation of an organism that is an exact genetic copy of another. This means that every single bit of DNA is the same between the two!
How does one go about making an exact genetic copy of an organism? There are a couple of ways to do this: artificial embryo twinning and somatic cell nuclear transfer.
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2. These views may be grouped under three categories:
(a) geosynclinals evolution
(b) plate tectonics
(c) vertical movements
3. TECTONICS PLATES
Our continents are carried by a series of tectonic plates
located in the earth’s lithosphere. These plates collide
with and separate from each other at different rates
determined by a process known as convection. Directly
below the lithosphere is the inner mantle known as the
aesthenosphere. Convection currents are generated in
the earth’s inner mantle as molten rock forms from the
radioactive decay of elements. As hot gas and liquid is
produced it moves upward, displacing the cooler and
denser gas and liquid. As this convection process
happens, those circulations push the lithosphere’s plates
(and the seven continents that sit on top of them), slowly
shifting the globe’s landscape over time. The direction
and rate of movement is totally dependent on what kinds
of convection currents are at work below.
4. Geosynclinals Evolution
Exponents of this opinion mainly base their deduction on the
sedimentary nature of the Himalayan rocks majority of which
have evidence of marine origin and contain fossils of marine
organisms. Even the enormous thickness of the Himalayan rocks
allows them to associate their deposition under the bed of sea
whose floor underwent sinking with the increasing weight of
the deposits.
The geosynclinals origin of the Himalayas has obtained maximum
approval from the scholars. The theories of Suess, Argand,
Kober etc. all belong to this category. According to geologists
the disintegration of Pangaea led to the formation of a long
Mediterranean sea (called Tethys) between the two land masses
of Angaral and (north) and Gondwanaland (south).
5. Vertical Movements
Those who advocate vertical movements responsible for the
upliftment of the Himalayas take support from the fact that
the gravitational force, the main force among the various
bodies in space, can act only radially inhibiting enormous
horizontal translocation implicit in plate tectonics.
6. Once, all the world’s landmass was
connected, forming one super-continent
known as Pangea.
Approximately 200 million years ago,
tectonic forces broke apart this giant
continent into pieces, eventually
forming the continents we know
today. As convection currents worked
independently on the plates
associated with these new continental
pieces, the plates and their
respective continents began to drift
across the globe to their present-day
geographical locations.
7. Eighty million years ago, India was approximately 6400 km (3968 miles) south of
the Eurasian plate. Separating the two was the Tethys Sea. The Indo-Australian
tectonic plate – containing the continent of Australia, the Indian subcontinent,
and surrounding ocean – was pushed northward by the convection currents
generated in the inner mantle. For millions of years, India made its way across
the sea toward the Eurasian plate. As India approached Asia, around 40 million
years ago, the Tethys Sea began to shrink and its seabed slowly pushed upwards.
The Tethys Sea disappeared completely around 20 million years ago and
sediments rising from its seabed formed a mountain range.
8. When India and Tibet collided, instead of descending with
the plate, the relatively light sedimentary and
metamorphic rock that makes up the subcontinent of
India pushed against Tibet, forcing it upwards, and
created a massive mountain fold. The Himalayas.
This process hadn’t stopped yet. The indo-australian plate is
still moving towards Eurasia ,still pushing Tibet
upwards.The Himalayas still continue to an average of
2cm every year .The highest mountains are only getting
higher.
9. According to Suess the folding of the Himalayas has been
caused by the com- pressional forces which have worked
from the north and led to the folding of the detritus
deposited in the bed of the Tethys. In this process the land
mass of Angara land lying north of the Tethys acted as
backland whereas Gondwanaland along the southern
margin of the Tethys behaved as foreland and remained
stationary. Due to the southward movement of
Angaraland the Tethyan sediment was compressed against
the Peninsular mass yielding place to three successive are
like ranges from west to east owing to two extended horns
of the Peninsula (the Aravalis and Delhi ridge in the west
and Meghalaya plateau in the east).
10. PARTS OF
HIMALAYAS
THE PARTS OF HIMALAYAS
ARE:
HIMADRI
HIMACHAL
SHIWALIK
11. HIMADRI
Great Himalayas, also called Higher Himalayas or Great Himalaya
Range, highest and northernmost section of the Himalayan
mountain ranges. It extends southeastward across northern Pakistan,
northern India, and Nepal before trending eastward across Sikkim
state (India) and Bhutan and finally turning northeastward across
northern Arunachal Pradesh state (India); throughout nearly all of its
length it adjoins to the north the southern Tibet Autonomous Region
of China. The range’s total length is some 1,400 miles (2,300 km),
and it has an average elevation of more than 20,000 feet (6,100
meters). The Great Himalayas contain many of the world’s tallest
peaks, including (from west to east) Nanga Parbat, Annapurna,
Mount Everest, and Kanchenjunga.
12. HIMACHAL
The state of Himachal Pradesh is spread over an
area 55,673 km² and is bordered by Jammu
and Kashmir on the north, Punjab on the
southwest, Haryana on the south, Uttarakhand
on the southeast and Tibet on the east.
Himachal is a mountainous region, rich in its
natural resources.
Elevation ranges from 450 meters to 6,500
meters above sea level. The region extends
from the Shivalik range of mountains (barely
mountainous region). There is a noticeable
increase in elevation from west to east and
from south to north.
13. SHIWALIKS
The Shiwalik hills is a mountain range of the outer Himalayas
also known as Manak Parbat in ancient times. Shivalik
literally means 'tresses of Shiva’. This range is about
2,400 km (1,500 mi) long enclosing an area that starts
almost from the Indus and ends close to the Brahmaputra,
with a gap of about 90 kilometers (56 mi) between the
Teesta and Raidak rivers in Assam. The width of the
Shivalik hills varies from 10 to 50 km (6.2 to 31.1mi), their
average elevation is 1,500 to 2,000m (4,900 to 6,600 ft).
14. RIVERS OF HIMALAYAS
The five main rivers of the Himalayas are the Jhelum,
Chenab, Ravi, Beas, and Sutlej. The Himalayas is the
birthplace of many important rivers. The rivers of the
Himalayas give a new dimension to the beautiful scenic
beauty of the Himalayan region. The rivers are the main
source of life in those areas. It helps in the formation of
the forest belt and irrigation process in these regions.
15. TOURIST SPOT (HIMALAYAS)
The panoramic view of the mountain ranges attracts traveler across the
world. The early Aryans use to consider Himalayas as the adobe of Gods
and Goddess. In 1852 the highest mountain in the world was named
after Sir George Everest as Mount Everest. Some facts about the
Himalayas expeditions are: As Nepal opened its frontiers in 1949 to the
outside world people explored ten of the fourteen 8000m peaks. Some of
the major among them are
Annapurna (8091m) was the first peak to be climbed in 1950, and then
in 1953 it was Mount Everest (8848m) and Nanga Parbat (8125m). From
that time onwards many expeditions have been made and by 1964 all
the Himalayan peaks had been climbed.