Earth

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  • middle (2nd oldest)
  • 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.
  • oldest
  • Youngest
  •  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!
  • I guess I should, but I forgot. Gotta blast!
  • Hey, get back here!!!
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