A smooth, flat break in a mineral is called _______.

Scientists use which scale to describe the hardness of a mineral?

A rough, uneven break in a mineral is called ________.

What is the softest mineral?

Which mineral has a hardness scale of 10?

The color of a mineral when rubbed against a peice of porcelain is called ________.

What type of Igneous rock is formed when magma cools quickly?

Choose the correct sequence to the formation of an Igneous rock.

What type of Igneous rock is formed when lava cools quickly?

All rocks are made of __________________.

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