Structure of the Atom, Rocks and Materials Flashcards
rocks are made of…
different grains that fit together
interlocking grains
grains that fit together with no gaps
texture of the rock
the combination of sizes and shapes of minerals
indigenous rocks are formed…
when molten rock cools down and freezes
extrusive indigenous rocks
rocks that are fromed from cooling lava
metamorphic rocks
when high temperatures and pressures cause changes in the minerals in rocks and new crystals form
chemical weathering
when the rain falls onto rocks and it can react with the minerals in the rocks
physical weathering
things that happens to the rocks that you can see
fossils form…
when dead plants or animals become covered in layers of sediment before they rot away
intrusive igneous rocks
igneous rocks that form underground
biological weathering
plant roots can grow into cracks in the rocks, when the roots grow bigger they make the cracks wider and the rock and break apart
freeze-thaw action
water gets into the cracks in rocks and freezes, because water expands when it freezes, the cracks get bigger
erosion
when bits of rocks get moved away from the place where they were formed
sediment
the bits of rock and sand, in streams or rivers
abrasion
when rocks fall into the stream or river, they can get transported and as the water moves in the rock fragments knock against each other and wear away
