Rocks Identification

The andesite shown here is an igneous rock.  We know that it cooled rapidly because it has a fine texture with no large crystals showing.  What kind of rock type is this?

• clastic sedimentary
• intrusive (underground) igneous
• extrusive (above ground) igneous
• nonfoliated metamorphic

Basalt, the rock shown here, is a form of igneous rock that has small crystal sizes, a fine or even texture and has cooled above ground. It is

• intrusive
• extrusive

Andesite, the rock shown here, is a form of igneous rock that has large crystal sizes, a coarse texture and has cooled slowly below ground. It is

• intrusive
• extrusive

Basalt, the rock shown here, what kind of rock

• intrusive igneous
• extrusive igneous
• foliated metamorphic
• nonfoliated metamorphic

Granite, the rock shown here, what kind of rock

• intrusive igneous
• extrusive igneous
• foliated metamorphic
• nonfoliated metamorphic

Look carefully at the chart.  Be aware that igneous INTRUSIVE rocks will have much bigger crystals than igneous EXTRUSIVE rocks.  Which of the rocks below should have BIGGER crystals

• Diorite
• Andesite

Look carefully at the chart.  Be aware that igneous INTRUSIVE rocks will have much bigger crystals than igneous EXTRUSIVE rocks.  Which of the rocks below should have BIGGER crystals

• Gabbro
• Scoria

Look carefully at the chart.  Be aware that igneous INTRUSIVE rocks will have much bigger crystals than igneous EXTRUSIVE rocks.  Which of the rocks below should have the biggest crystals

• Rhyolite
• Scoria
• Granite

This is diorite, an igneous rock.  How can you tell that it cooled slowly underground and so must be intrusive igneous?

• It has banded stripes
• it is clearly deformed
• it has large, coarse crystal
• it was found next to a volcano

This is a striped, or banded, metamorphic rock. Which type is it?

• foliated
• nonfoliated