Other Chapters' Lyrics:

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

Other Chapters' Notes:

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

 

Back to the full science song list. -:- Download free mp3 of this song. -:- Composer's home page.

 

_______________________________________________________________________________________

 

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 Africa and South America were connected to each other.

·        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.