Podcast
Questions and Answers
What is the primary color of basalt?
What is the primary color of basalt?
- Grey/black (correct)
- Pink
- Blue
- Cream
Granite is an extrusive rock formed by the rapid cooling of lava.
Granite is an extrusive rock formed by the rapid cooling of lava.
False (B)
What type of rock is basalt and how does it form?
What type of rock is basalt and how does it form?
Basalt is an extrusive rock formed when lava cools and hardens quickly on the Earth's surface.
Granite is known for its __________ texture.
Granite is known for its __________ texture.
Match the following rocks with their characteristics:
Match the following rocks with their characteristics:
Flashcards
Basalt formation
Basalt formation
Basalt forms when lava hardens quickly on the Earth's surface.
Granite formation
Granite formation
Granite forms when magma cools slowly underground.
Basalt texture
Basalt texture
Basalt has a medium-grained texture, with tiny crystals.
Granite texture
Granite texture
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Basalt use
Basalt use
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Study Notes
Basalt
- Colour: Grey/black
- Texture: Medium grained
- Formation: An extrusive rock, formed when lava spreads over Earth's crust during volcanic activity. It cools and hardens quickly, creating tiny crystals that are not visible without a microscope.
- Use: Used in road chippings due to its hardness. It also creates attractive landscapes, like tourist attractions.
- Example: Found in Antrim-Derry Plateau, Northern Ireland (Giant's Causeway). The hexagonal shapes of the basalt columns are formed due to contraction of the lava as it cooled.
Granite
- Colour: Range of colors (black, grey, pink, cream)
- Texture: Coarse grained
- Formation: An intrusive rock, formed when molten magma pushes into the Earth's crust. It cools slowly, creating large crystals.
- Composition: Contains minerals like quartz, feldspar and mica.
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