The document discusses three types of weathering: physical, chemical, and biological. Physical weathering breaks rocks into smaller pieces through expansion and contraction from temperature changes. This includes freeze-thaw weathering, where freezing water in cracks expands and causes rocks to weaken over time. Chemical weathering dissolves or breaks down rocks through acid, such as from acid rain interacting with minerals like limestone. Biological weathering results from plant roots and animal burrowing putting pressure on rocks. The rate of weathering has increased due to human pollution contributing to more acid rain.
S6E5. Students will investigate the scientific view of how the earth’s surface is formed.
d. Describe processes that change rocks and the surface of the earth.
S6E5. Students will investigate the scientific view of how the earth’s surface is formed.
d. Describe processes that change rocks and the surface of the earth.
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http://sandymillin.wordpress.com/iateflwebinar2024
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Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
2. Three types of weathering:
1. Physical weathering
2. Chemical weathering
3. Biological weathering
3. Physical Weathering / Mechanical
Weathering
This happens when rocks are broken down into
smaller pieces through expansion and contraction.
Rocks expand and contract due to temperature
changes.
Physical weathering due to temperature changes
usually happens in areas where there is a large
temperature range (hot in the day and very cold at
night).
There are TWO types of physical weathering that
happen as a result of expansion and contraction:
4. 1. Freeze-thaw weathering (Frost
shattering)
Water is trapped in the joint (crack) of a rock.
At night, when the temperature drops below 0°C
, the water that is trapped in the rock becomes
froze, it expands.
During the day, as the temperature increases, the
water melts, causing the rock to contract.
After some time, if this happens repeatedly, the
rock will weaken and eventually shatter into
pointed fragments.
These pointed (angular) fragments are then
deposited at the foot of the slope and are known
as scree.
5.
6. 2. Exfoliation
Repeated heating and cooling can cause the
outer layers of a rock to peel off in thin sheets.
7. Chemical weathering
This happens when rocks are exposed to acid .
Acid rain is the main cause of Chemical Weathering.
As rain falls from clouds it absorbs the carbon dioxide
in the atmosphere . The water and carbon dioxide mix
to form an acidic rain.
This acid from the rain enters the cracks of rocks
widening them. . The acid also dissolves or eats away
the rocks causing them to become weaker and break
apart.
8. 1. Dissolved
Rain water can dissolve limestone out of rocks.
These rocks become weak and begin to break up.
The limestone surface is called a limestone
pavement and is weathered to form grooves
called grikes and flat-topped ridges called clints.
Limestone caves can also result when the
underground limestone is dissolved and removed
(for example, the Cango Caves in Oudtshoorn).
12. 3. Plant acids
Organic acids which are secreted (given off) by
plants result in rocks breaking down chemically.
13.
14. (c) Biological weathering
Caused by living animals
1. Growth of roots
This is often the most
common type of
biological weathering.
The roots of trees grow
into cracks and joints,
breaking rocks apart.
15. 2. Animals burrowing
Animals who burrow underground to make
home often disturb rocks, which can result in
rocks breaking up.
16.
17. Location of weathering types
Weathering type Where it usually happens
Physical (Exfoliation,
Pressure release)
Hot deserts
(there are big differences between daytime and
night time temperatures)
Freeze-thaw Very cold areas
(daytime temperatures are above freezing point,
but night time temperatures drop below 0°C)
Chemical
In all areas where there is rain but more
commonly in hot areas where there is high
rainfall (because heat speeds up chemical
reactions)
18. Impact of human activities on
weathering
Industries (factories), power stations and vehicle
emissions have significantly increased chemical
pollution in the atmosphere which has greatly
increased the rate of weathering.
19. Acid rain, which is able to erode rocks such as
limestone, is caused by the increase of gases such
as carbon dioxide, nitrogen oxide and sulphur
dioxide. These gases increase the rate chemical
weathering processes.
Acid rain causes limestone buildings to
deteriorate. It also causes metals to rust.
Granite is a very strong rock so buildings which
are starting to deteriorate are given a granite
covering.
20. Now for an activity!!!
Complete activity 3.1 and 3 .2 in your textbook .