Earth’s Interior Notes (textbook pg. 167) Main Idea Details P1), Earth is Cooling losing heat over time outer layer (crust) is coolest temperature & pressure increase as move in towards center of earth P2) Crust Two types of crust: oceanic: 510 km (36 mi) of rock under oceans continental: 1570 km (1243 mi) of rock under land P3) Mantle 2900 km (of dense rock 83% of earth’s interior! P3) Lithosphere top,cool, rigid part of mantle + crust!