Chapter 4, sec 2-3

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Rock formed when an existing rock changed by heat, pressure or chemical reactions. Form deep underground-

When lava cools quickly, crystals are

Most of the Earth's minerals contain

Formed from other rock particles or plant or animal remains and pressed and cemented together

Basalt is the most common of this type of _____________rock , formed from lava that erupted onto the Earth\\\\\\\'s surface.

Slow cooling results in ________ crystals

Lava that is low in silica forms basalt which is very _______ in color.

Igneous rocks are classified according to their origin, mineral composition and