oxegen

=**__ section 1: earths interior __**= = this section is all about the layers of of the earth and seismic waves = = seismic waves are caused by earthquakes. we know the center of the earth is solid because of this because scientist thought "wouldint it be felt on the other side of the earth ?" so they tested it and and did not feel the earth quake so we knew some thing was stopping it and we concluded that the inner core was solid.we also learned that the lower you go in the ground the more pressure that applies and the higher you go the less pressure you have on you. for example if you dive 10 ft. under water you will feel the pressure on your ears and if you go into the moutains or in an air plane you feel lighter and your ears will get stuffy. the next thing we learned was that the crust is kind of a skin for the earth tou can test this if you boil an egg and cut in half you can think of the shell as the crust and the white as the mantle and the yoke as the outer and inner core. the crust is made out of oxegen,silicon,aluminum,calcium,iron,sodium,pottasium,magnesium. = = the crust is 5-70 km thick suprisingly it is the thinnest of all the layers and not so suprising it is the coldest one out of them all. the next layer is the mantle it is a lot hotter and and is 2,867 thick the thickest of them all. it is made out of silicon, oxegen,iron, and magnesium. the next layer is very interesting because it is the only layer that' state is liquid and and is made out of nickel and iron and is even hotter. = = last but not leats the inner core it is solid and it has iron and nickel it is the dense it is explained this viedeomedia type="custom" key="11532802" = = = = =