9.3 Hot Rocks Flashcards
rocks that form from the cooling of lava or magma as it is thrown through the air from a volcanic eruption
igneous rocks
igneous rock that forms when lava cools above the Earth’s surface
Extrusive Rocks
a pale rock that forms when frothy lava cools in the air. Pumice often floats on water as it is very light and full of holes that once contained gas.
Pumice
a dark, igneous rock formed from gassy lava that cools quickly
Scoria
a property of a material or substance that easily scratches another
Abrasive
a dark, igneous rock with small crystals formed by fast cooling of hot lava. It sometimes has holes that once contained volcanic gases.
Basalt
a black, glassy rock that breaks into pieces with smooth shell-like surfaces
Obsidian
igneous rock that forms when magma cools below the Earth’s surface
intrusive rocks
intrusive rock mass that measures more than 100 kilometres across
Batholiths
a hard, igneous rock with different-coloured crystals large enough to see. It forms slowly below the Earth’s surface.
Granite