mantle - location of convection currents, pangaea - supercontinent that existed millions of years ago, less distance between objects - greater gravitational pull, crust - made of basalt rock and granite rock, mid ocean ridge - molten material rises from the mantle and erupts here during sea floor spreading, abyssmal plain - nearly flat region of the ocean floor covered with thick sediment, mid ocean ridge - continuous chain of mountains, troposphere - the layer of the atmosphere where weather occurs, UV radiation - absorbed by the ozone layer in the stratosphere, longer days - experienced when the north end of the earth's axis is tilted towards the sun, seasons - the result of the Earth being tilted on its axis, solar eclipse - occurs when the moon is between earth and sun, tides - caused by the gravitational pull of the moon, volcanoes - form when plates collide and one is subducted under another, sun - major source of energy for the water cycle,

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