IGNEOUS ROCKS

Question 1

Basalt

Answer 1

Igneous, Volcanic. Dark iron rich rock. Thick and extensive, in which gas cavities are almost absent. Comes from magma, that forms oceanic crust.

Question 2

Igneous rocks

Answer 2

All rocks that arise from cooling of magma. Rocks and sediments of subducted crust melt. Magma is formed. It rises to the earth’s crust. Cooling minerals begins to crystalize. Formes igneus rocks

Question 3

Volcanic Rocks

Answer 3

Igneous rocks. Formed when magma reaches earth’s surface. Magma erupted in form of lava. Cools quickly. Solidifies.Amorphous structure. Contain phenocrystals. Porous.Often vesicular texture. Light weight. Individual minerals can’t be distinguished. Colour indicates mineral content.

Question 4

Plutonic Rocks

Answer 4

Igneous rocks. Magma remains in continental crust-> solidifies. Cooling happens very slowly. Crystaline structure. Clearly visible minerals. Dense. The grains are of roughly equal size.

Question 5

Granite

Answer 5

Igneous rock. Plutonic. Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles, and other minerals. Red, pink, gray, or white color with dark mineral grains visible throughout the rock.Dominant igneous rock.Lighter than basalt (less iron)

Question 6

Mineral

Answer 6

Solid with specific physical properties and chemical composition. Building blocks of rocks..

Question 7

Phenocrystals

Answer 7

In volcanic rocks. Minerals formed before volcanic eruption

Question 8

Can volcanic rocks occur without phenocrystis?

Answer 8

Yes: Obsidion. fast cooling of lava . glassy.

Question 9

Crystaline granite or amorphous basalt: easier to weather into soil?

Answer 9

.

Question 10

Phenicrysts

Answer 10

Large Crystals, distinctly larger than grains in rock in an igneous rock

Question 11

Intrusive igneous rock

Answer 11

Formed from magma that cools and solidifies within crust

Question 12

Extrusive igneous rock

Answer 12

Formed on surface of earth from lava