Rocks 6.2R

Molten rock is called two different names depending on where it is.  What of the following shows the correct name with the correct place it is found.

• It is called magma when found below ground and lava when found above ground.
• It is called magma when found above ground and lava when found above ground.
• It is called magma when found below ground and lava when found below ground.
• It is called magma when found above ground and lava when found below ground.

Why do different igneous rocks have different sized crystals?

• They are different colors.
• They are different shapes.
• They were heated differently.
• They cooled at different rates.

This type of igneous rock is created when volcanic material erupts, cools and crystallizes on Earth's surface.

• Intrusive Igneous Rocks
• Extrusive Igneous Rocks
• Both of these are correct.
• None of these are correct.

When magma underground containing dissolved gases comes to Earth's surface the pressure decreases and the gases separate.  What noticeable features do these kinds of rocks have?

• large crystals
• holes
• smooth surfaces
• none of these are correct

Which of the following is a common example of an intrusive igneous rock?

• pumice
• obsidian
• granite
• andesite

Which of the following is a common example of and extrusive igneous rock?

• granite
• diorite
• sandstone
• basalt

Why does the magma cool slowly inside our Earth's crust?

• it is insulated by solid rock
• it is insulated by water
• it is insulated by a blanket
• none of these are correct

 This type of igneous rock is created when magma cools slowly, forms well defined crystals randomly arranged and interlocking.

• Intrusive Igneous Rocks
• Extrusive Igneous Rocks
• Both of these are correct
• None of these are correct

Which of the following are used to identify igneous rocks?

• arrangement and size of crystals
• mineral composition
• none of these
• both of these

When looking at igneous rocks, texture is determined by looking at........

• the mineral crystals' size and arrangement in the rock
• the color and size of the minerals' crystals
• the minerals' crystals color and arrangement in the rock
• none of these are correct