Rocks and Mineral Composition Lesson

According to the Mohs Hardness Scale, which mineral is the softest?

• calcite
• fluorite
• talc
• diamond

According to the Mohs Hardness Scale, which mineral is the hardest?

• calcite
• diamond
• quartz
• talc

A mineral is inorganic, which means that it contains

• compounds
• materials made by humans
• parts of a living thing
• no materials that were once part of living things

The color of mineral's powder is called its

• streak
• luster
• density
• hardness

Geologist classify metamorphic rock by 

• the exterior color of the rock
• the overall shape of the rock
• the arrangement of the layers that make up the rock
• the degree of hardness of the rock

Rock that forms from the cooling of magma below the surface or lava at the surface is called

• sedimentary rock
• metamorphic rock
• igneous rock
• coarse-grained rock

The term used to describe how light is reflected from a mineral's surface is

• fluorescence
• streak
• density
• luster

Igneous rock that cools very slowly from magma is 

• extrusive rock
• multi-colored and banded
• coarse grained
• intrusive rock

When all of the grains in a rock are large and easy to see, the rock is described as

• extrusive
• fine grained
• coarse grained
• non-banded

Igneous rock that formed from lava that erupted onto Earth's surface is called

• extrusive rock
• intrusive rock
• clastic rock
• sedimentary rock