__________ 1. An igneous rock that contains the debris from an explosive volcanic
eruption. It often contains fragments of bedrock, tephra, and volcanic
ash
___________2. A light-colored igneous rock with grains large enough to be visible with
the unaided eye. It forms from the slow crystallization of magma below
Earth's surface.
___________3. A coarse-grained, dark-colored, intrusive igneous rock. It is usually
black or dark green in color and composed mainly of the mineralsplagioclase and augite.
__________ 4. A dark-colored, fine-grained, igneous rock composed mainly of
plagioclase and pyroxene minerals.
__________ 5. A group of coarse-grained igneous rocks with a composition between
that of granite and basalt. It usually occurs as large intrusions, dikes,
and sills within continental crust.
__________ 6. A volcanic glass similar in composition to granite, usually dark but
transparent in thin pieces, and having a good conchoidal fracture.
__________ 7. An extrusive igneous rock with a very high silica content. It is usually
pink or gray in color with grains so small that they are difficult to
observe without a hand lens.
__________ 8. A vesicular, foamy, very light weight, light colored rock formed by
abundant, rapid gas escape during formation. It is often a pyroclastic
product.