ENVS 1050 Chapter 1: Geology Notes - week 1

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Monday, June 30, 2014
Geology Notes - week 1
Origin of the Solar System and the Earth
Chapter 1 - pages 10-11
earth is approximately 4.6 billion years old
recent earthquakes caused displacement of the crust which makes lava erupt from
active volcanoes
the planet has attained its present form and structure
13.7 billion years ago started with the BIG BANG - then the milky way formed
nebular theory: suggests that the bodies of our solar system evolved from a rotating
cloud called the solar nebula that is composed of mostly hydrogen and helium.
this began about 5 billion years ago then the large disk had a large centre called the pro
sun or what we know as the pre-sun
during the decrease in temperature, some substances with high melting points caused
to join together
other clumps that did not join the pre sun were called pre planets and others that stayed
in the orbit are called meteoroids or asteroids and become meteorites when they impact
the earth and still survive
Earth structure:
-core: iron rich formed by fast melting that caused blobs of heavy metal that sank
towards the middle of the planet
-crust: molten material that rose to the surface that solidified to produce what we call
the primitive crust
-mantle: earth’s largest layer which is between both the crust and the core that is rich
in iron, magnesium as well as oxygen elements
1
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