Flashcards
Igneous Rocks
Cards in this deck (15)
- 1What was the first rock formed on Earth?Igneous rock was the first rock to form on Earth.
- 2What are igneous rocks?Igneous rocks are rocks formed from cooling magma.
- 3What is geology?Geology is the study of rocks.
- 4What is magma and how is it formed?Magma is molten rock that doesn't reach the Earth's surface. Scientists believe magma is formed within the lower mantle. Dissolved gases make the magma less dense than the rocks surrounding it which pushes it up through the crack in the crust above.
- 5What is lava?Lava is the molten rock that reaches the Earth's surface.
- 6What happens if the eruption happens under the ocean?The magma reaches up to the surface to become lava but then cools very rapidly.
- 7Where do rocks form?Some rocks form at the surface, below the ground or under the ocean.
- 8What are extrusive igneous rocks?Extrusive igneous rocks are rocks that form on the surface of the Earth.
- 9Name four examples of extrusive igneous rocks.Four examples could be basalt, scoria, obsidian and pumice.
- 10What are crystals?Crystals are solids that have a variety of special shapes.
- 11How do crystals form?Crystals form when the magma solidifies and the particles in the liquid clump together to form the structure.
- 12What are minerals?Minerals are the chemical substances that make up the rocks.
- 13List the characteristics of igneous rocks.Igneous rocks are hard, strong and made of interlocking crystals that grow into each other and lock together.
- 14What are intrusive igneous rocks?Intrusive igneous rocks are igneous rocks that form below the surface of the Earth.
- 15Name four examples of intrusive igneous rocks.Four examples could be granite, dolerite, peridotite and gabbro.
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- Flashcards on Igneous Rocks, created by Zahraa Al Awadi on 05/12/2016.
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- Zahraa Al Awadi
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