Caves and the earths crust

This week me and my classmates watched Bill Nye the science guy about the earth crust and learnt that molten rock was under the earths crust and that the core is the center, 2nd part is the outter core and that the 3rd layer is mantle and that the core is 1500 celsius. Mt st Helens can be the worlds next super volcanoe and hot water springs are like volcanoes but with water and the center makes the Gravity.
I also learnt about cave and they the same temperature and it is very wet.You can find caves under ice,water and the ground and limestone is calcium, thats why it can dissolve. Stolacite is on the top and stalagmite is on the bottom. Trogloxenes are cave visitors, troglophytes love caves and troglodytes are wet animals or fish.

I want to learn the earths weather and rocks, minerals(mining) and the rock cycle bassicly everything!!!!!!!!!