Helen Claire Gould, an author and geologist, discussed various rock types on Luke Chillingsworth's Sunday radio show. She described basalt as the most common rock in the solar system, noting its dense and fluid nature. Vesicular basalt contains gas bubbles that escaped during cooling. Biotite granite contains visible minerals like mica, albite, and quartz. Gabbro forms coarse crystals and occurs in new island settings. Obsidian and snowflake obsidian are volcanic glasses. Pumice is very light due to its frothy, glassy nature. Agglomerate forms when volcanic debris of various sizes fuses together. Banded iron formation is an ancient rock with red chert and
It was too cold to go out rock collecting this winter. Instead the students went rock hunting digitally. They were given two grades for their powerpoints, the science grade based on the accuracy of their information and a grade on using effective design skills in powerpoint.
It was too cold to go out rock collecting this winter. Instead the students went rock hunting digitally. They were given two grades for their powerpoints, the science grade based on the accuracy of their information and a grade on using effective design skills in powerpoint.
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A really useful Revision resource about Geology, covering everything on the topic including:
- Igneous Rocks
-Sedimentary Rocks
- Metamorphic Rocks
-Physical, Biological and Chemical Weathering
- Transportation and Erosion
- Fossils
- Minerals
Using this revision guide you will know everything you need to know about Geology.
This explains each rock in the Rock Cycle and is perfect to teach a lesson or to help you with homework. It explains how the rock is formed, it's properties and examples of the rocks.
Here is an example of the props we plan to use in our music video. These are not identical representations of what we will be using, but do offer an idea of what we will try and base our final props on.
Here is an example of the type of costumes we would like to use in our music video for Nikki J's The Way You Do. These are not photo representative but give an idea of the sort of thing we are planning to use.
Boudoir photography, a genre that captures intimate and sensual images of individuals, has experienced significant transformation over the years, particularly in New York City (NYC). Known for its diversity and vibrant arts scene, NYC has been a hub for the evolution of various art forms, including boudoir photography. This article delves into the historical background, cultural significance, technological advancements, and the contemporary landscape of boudoir photography in NYC.
Hadj Ounis's most notable work is his sculpture titled "Metamorphosis." This piece showcases Ounis's mastery of form and texture, as he seamlessly combines metal and wood to create a dynamic and visually striking composition. The juxtaposition of the two materials creates a sense of tension and harmony, inviting viewers to contemplate the relationship between nature and industry.
Fashionista Chic Couture Maze & Coloring Adventures is a coloring and activity book filled with many maze games and coloring activities designed to delight and engage young fashion enthusiasts. Each page offers a unique blend of fashion-themed mazes and stylish illustrations to color, inspiring creativity and problem-solving skills in children.
This document announces the winners of the 2024 Youth Poster Contest organized by MATFORCE. It lists the grand prize and age category winners for grades K-6, 7-12, and individual age groups from 5 years old to 18 years old.
1. Sunday Rocks!
A Presentation of Rocks Discussed by Helen Claire Gould,
author & geologist,
on Luke Chillingsworth’s Sunday Show
On Sunday 12th October, 2014.
2. Basalt
Basalt is the commonest rock in
the Solar System. It forms the
ocean floors, and also occurs in
many island settings. Hawaii,
Iceland and Madeira are islands
made of basalt. It is erupted at
mid-ocean ridges.
It’s a dark rock, and is very heavy
because it’s very dense. It also is
quite a fluid rock, so it’s able to
form lava tubes, rolling down
volcanic flanks for sometimes many
miles. As the flow front progresses
the lava drains forwards, keeping
the tube growing.
Because it’s so dense it can be
subducted under continental rocks.
3. Vesicular Basalt
A vesicle is a hole in the rock, and
this has loads! They’re formed by
escaping gas bubbles as the
basaltic magma comes to the
surface.
This rock has sharp edges, and also
feels quite heavy.
When the vesicles become infilled,
over time, with minerals, they are
known as amygdales.
4. Biotite Granite
Biotite is a type of mica, and as all
rocks are made of minerals such as
mica, knowing what they are can
help to identify them.
This rock is black, white and grey,
with a speckly appearance, and
relatively coarse-grained, as the
mineral particles can be seen with
the naked eye.
The minerals in this rock are mica
(black), albite (white), and quartz
(grey).
If basalt is the rock of the ocean
floors, granite is the rock of the
continents. Compared with basalt
it’s light in weight and colour,
which is why basalt gets subducted
below it at oceanic trenches.
5. Gabbro
Gabbro is a very coarse-grained
volcanic rock – you definitely can
see the mineral grains with the
naked eye!
It often occurs in situations where
a new island is being formed. In
Lanzarote it formed the basement
rocks of the island of La Graciosa,
at the top of the main island.
It contains 50-60% plagioclase
feldspar, with olivine, quartz and
other minerals making up the rest.
6. Obsidian
Obsidian is a black volcanic glass
which can be knapped in the same
way as flint to produce knife-edges,
spear tips, hand axes and so
on.
The curving fracture surfaces you
can see are typical of both
obsidian and flint, as well as being
a distinctive feature. This is called
conchoidal fracture.
It is very shiny, a feature known as
vitreous lustre.
7. Snowflake Obsidian
Obsidian is a glass, which means it
cools very quickly, too quickly for
minerals to grow in the liquid.
Snowflake obsidian is volcanic glass
in which, over time, minerals have
grown. These can be seen as white
or grey flecks and patches in the
black glassy matrix.
The mineral is cristobalite.
8. Pumice
Pumice is well-known as the stuff
used to get rid of hard skin on the
feet.
It’s such a light rock that it floats
on the sea surface when erupted
beside an ocean or undersea.
Compare it with basalt and you’ll
really notice the difference.
The lightness of this rock is due to
it being, effectively, a froth of
glass. The magma contains lots of
gas, which escapes on eruption,
and the remaining material cools
very quickly, before crystals can
form.
9. Agglomerate
Magma can be erupted as a variety
of sizes of solid particles, ranging
in size from fine ash to blocks and
bombs.
The larger particles can be as big
as a house. But smaller blocks and
bombs can form into a rock layer,
similar to the way some sediments
become sedimentary rocks. The
particles fuse together due to the
heat as they fall back to the
ground, and layers can build up on
top of one another during
successive eruptions.
10. Banded Iron Formation
This slice of tumbled and polished
rock is about 2.5 billion years old –
over half the age of the Earth.
The red bands are chert, a type of
silica not unlike flint, and the grey
bands are iron.
Due to our atmosphere, free iron
isn’t found on Earth, though it is
found on the Moon.
This rock was laid down during the
formation of our present
atmosphere.