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Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3
Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3
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Earth Science Chapter 7 - Summary Notes
·
The Earth is divided into three
layers-the crust, mantle and core.
·
The crust is the thinnest layer
(less than 1% of Earth’s mass) and the layer we live on. Continental crust is thicker but less dense
that oceanic crust.
·
The mantle is the layer in
between the crust and the core. It
contains two-thirds of the Earth’s mass.
Some of the mantle reaches us through volcanoes, but no one has ever
seen what the mantle really looks like.
·
The core is even more of a
mystery to geologists. It is just a
little bigger than Mars.
·
Tectonic plates make up the
lithosphere, which is the outermost layer of the crust. They divide the earth into puzzle-like
pieces.
·
The theory of continental drift
proposes that the plates have moved away from their original location. Originally, continents like
·
It is thought that all of the
continents were once a single landmass we call Pangaea.
·
Two tectonic plates that slide
into each other meet at a convergent boundary.
Two tectonic plates that move away from one another form a divergent
boundary.
·
Two tectonic plates can also
slide past one another at a transform boundary.
This is the cause of earthquakes.
·
Stress is the amount of force
per unit area that is put on a given material.
Rocks deform, or change shape, due to stress.
·
Squeezing stress causes
compression. Stretching stress is
tension.
·
Stress can cause rocks to
bend. This activity is called folding.
·
Stress can also cause rock
layers to break and slide past each other.
This creates a fault. Faults and
folds are two sources of mountains.