The Law of Superposition states that in any unperturbed sequence of rock layers, the bottom layer will always be the oldest & the top layer will always be the youngest. Each layer towards the top is younger than the one beneath it.
There are 3 types of rock: Sedimentary, igneous, & metamorphic. Igneous rock is formed from cooled lava & usually contains crystals. Metamorphic rock is formed when already-existing rocks undergo heat pressure. Sedimentary rock forms when sediments deposit & form layers.
Can't you find fossils in rocks? Dinosaur bones! Mummies!
Yep! The fossil record shows the count of fossils discovered & the information regarding them or anything about them. The fossil record led to the discovery of an incredibly important concept--Pangaea.
Fast forward 4.3 billion years later... The supercontinent Pangaea formed!
It broke apart and formed today's 7 continents right? So that's why it all fits like a puzzle!
Continental drift caused Pangaea to break apart. Convection currents causing the movement of tectonic plates also contributed to the split. Tectonic plates are plates that glide over Earth's mantle.
Ooh! I remember! Plate boundaries are where these plate tectonics meet. In a divergent plate boundary, the plates are moving away from each other--they may form canyons. In convergent plate boundaries, the plates move towards each other to collide--an example behind the Himalayan Mountains.
Good job! But shouldn't you already know all this? Name these boundaries!