Current Event Numero Uno aka Earth's Interior Lesson

In class just a few days ago, my red class and I read and learned about the Earth's Interior (hence the name/topic title) and the following is what I learned:

~the Earth's suface (crust) is always changing form (because of tectonic plates-from Bill Nye the Science Guy)
~the farthest mine in the world is a gold mine in South Africa, which has a depth of 3.8 km
~but in order to reach the Earth's core, you need to reach down farther-1,600 times more farther to be exact
~geologists dig/drill down deep inside the Earths to learn about its structure
~samples of rock come up from the 12km deep holes
~in these samples of rock geologists can form a conclusion on how the Earth is doing
~indirect methods are how scientist observe the Earth, too
~when earthquakes happen, seismic waves also occur
~pressure and temperature contribute greatly to the topic because...
~as you go deeper in to the Earth rock formations in the Earth begin to grow cooler
~after about 20 meters your instruments would indicate that it's getting warmer
~this keeps going on for every 40m the temperature rises 1 Celsius
(1.00000 Celsius = 33.80000 Degree Fahrenheit)
~the definition of pressure is a force pressing on an area
CRUST-5-70km
MANTLE-2,867km
OUTER CORE-2,266km
INNER CORE-1,216km