Rock6
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- What is rock?
- solid, natural material made up of one or more minerals
- How is sedimentary rock formed?
- made from pieces of rocks and minerals, forms in layers with the oldest rock at the bottom
- How is igneous rock formed?
- forms when magma (molten rock inside the Earth) cools and hardens
- How is metamorphic rock formed?
- forms when heat, pressure, or chemical reactions change one type of rock into another type of rock
- What role does pressure have in the rock cycle?
- Pressure is involved in the formation of both sedimentary rock and metamorphic rock.
- You find a rock that contains a fossilized fern leaf. What type of rock is this?
- sedimentary
- How are fossils made?
- Fossils are made when an animal or plant is buried in soft mud.
- What is relative dating?
- Because sedimentary rock forms with the oldest layer at the bottom, scientists can learn the age of the layer and the materials found in it.
- Why do minerals have geometric shapes?
- Minerals are made of crystals, which are geometric because of the way their particls are arranged.
- We find a layer of rock that contains fossilized marine organisms. If the layer is in the middle of Ohio, what do we know about the area's history?
- At one time, the middle of Ohio was covered by salt water.