team+oxygen

=**__ section 1: earth s 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 scientists thought "wouldn't 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 something 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. underwater you will feel the pressure on your ears and if you go into the moutains or in an airplane 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 you 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 oxygen,silicon,aluminum,calcium,iron,sodium,pottasium,and magnesium. The crust is 5-70 km thick suprisingly,it is the thinnest of all the layers and it is the coldest one out of them all. The next layer is the mantle. The mantle is a lot hotter and is 2,867 thick, being the thickest of them all. It is made out of silicon, oxygen,iron, and magnesium. The next layer is very interesting because it is the only layer that's state is liquid and is made out of nickel and iron and is even hotter. Last but not least, the inner core is a solid and it has iron and nickel. It is the densest layer of them all 

__Section 2: Convection In The Mantle__ S 6.4.c. Students know heat from Earth's interior reaches the surface primarily through convection. We learned types of heat transfer: radiation, conduction, and convection. Convection occurs in the mantle, as heat from the core and mantle itself cause convection currents. Cooler denser rock sinks as the warmer less dense rock rises, then cools which creates the cycle. by Mason

secton 3 Drifting Continents =s 6.1.a In1910 a young German scientist named Alfred Wegener attempted to solve a jigsaw puzzle of the continents. Wegner's hypothesis was that all the continents were once joined together in a single landmass have since drifted appart.= =Wegener gathered evidence from different scientist fields to support his ideas about continental drift.He studied land features fossils and evidence of climate change.In 1915, Wegener published his evidence for continental drift in a book called The Origin and Oceans= =by Brett=