8th Earth Science Chapter 10 A B

Which is a characteristic of obsidian?

Continents were formed by the underlying rock called

Igneous rocks are not weather resistant.

Some rocks have no grains.

Old-earth view of rock origins

Igneous rocks are hard to work with, so special tools are needed.

What type of rocks are formed through the hardening of lava or magma?

All rocks have coarse grains.

Igneous rocks are generally ground up for gravel used in concrete because they are not very durable.

Igneous rocks are used for buildings and monuments because they

Can you see the crystals of fine-grained rocks with your eyes or a microscope?

What is another name for obsidian?

The granite state is

Which 2 rock categories are the sources of the third category?

Granite and basalt have been used for thousands of years for statues and monuments.

There is nothing unusual about rocks formed from volcanic lava.

Pieces and particles in a rock that determine texture are

Grains provide clues to how a rock was formed.

A natural combination of minerals or other materials

Which is not one of the categories for classifying rocks?

Which scientist studies rocks?

The cooling rate of lava is reliable for identifying the size of the grains.

Where do crystals begin to form before the lava erupts?

This igneous rock actually floats.

Atmospheric pressure affects the size of the grains in igneous rocks.

Igneous rocks contain