Flashcards
unit 8.2 igneous rocks
Cards in this deck (21)
- 1unit 8.2igneous rocks
- 2meaning of igneousborn of fire
- 3magmavery hot molten (melted rock)
less dense than surrounding rocks
doesn't reach the earth surface - 4lavamolten rock (magma) that reaches the earths surface
can be as hots as 1200C
erupts from volcanoes - 5how are igneous rocks formed?when magma or lava cools and crystallises
- 6the speed of magma coolingif magma reaches the surface to become lava then it cools rapidly especially if the eruption happened underwater. magma that doesn't reach the earths surface cools much more slowly
- 7extrusive igneous rocksrocks formed at or near the surface
- 8intrusive igneous rocksrocks formed from magma cooling below the surface
- 9what happens when lava cools quickly?it forms rocks with very small crystals or no crystals at all. crystals haven't had enough time to grow coz of the rapid cooling
- 10what happens when lava cools more slowly?rocks with larger crystals from coz particles within the magma can move around and keep adding to nearby crystals giving them time to grow
- 11what are igneous rocks made of?interlocking mineral crystals
- 12interlocking mineral crystalscrystals that lock together and grow into each other in a rock
- 13how are igneous rocks classified?by their texture & colour
- 14texturehow smooth or rough the rock is
best described by noting the size and shape of crystals and whether the rock has any air bubbles or any other observable features - 15colour-linked to the minerals the rock contains
-mafic rocks are usually made up of minerals such as olivine and pyroxene
-felsic rocks contain high levels of silica rich minerals such as quartz and feldspar - 16basalt usesbuildings and concretes
- 17dolerite usesroad surfaces and concretes
- 18granite usesbuildings, monuments, kitchens
- 19scoria useslandscaping
- 20pumice usessome soaps that feel rough on your skin
- 21obsidian usesscalpel blade for surgeons
ornaments and jewellery
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- Flashcards on unit 8.2 igneous rocks , created by Nimo Khalif on 24/10/2017.
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- Nimo Khalif
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