Earth History: Investigation 5-6

A student shared an igneous rock he bought that has beautiful fish and plant fossils in it. Another student gently pointed out that he may want to try to get his money back. How did the student know the rock was fake? (Mark the one best answer.)

• Fish and plants don't fossilize in the same rocks.

• It is impossible for fossils to form in igneous rocks.

• It is not legal to sell real fossils.

• Igneous rocks don't form underwater.

There is an area in Idaho called Craters of the Moon, where most of the ground is covered with basalt, a black igneous rock with no visible crystals. Which statement best describes how the rocks likely formed in this area? (Mark the one best answer.)

• The rocks cooled slowly below ground, and tiny crystals formed.

• The rocks were under tremendous heat and pressure, so no crystals formed.

• The rocks cooled quickly above ground forming crystals too small to see.

• Basalt rocks do not form crystals, no matter how they cooled.

Which sentence best describes the formation of igneous rock? (Mark the one best answer.)

• Lava on the surface dries up and makes a rock.

• Melted rock cools and forms crystals.

• Rocks are under tremendous heat and pressure and form crystals.

• Magma is melted rock underground.

The crust of Earth may include _____ . (Mark the one best answer.)

• continents and ocean floors

• continents only

• layers of sedimentary rock and continents

• all of the above

Your friend offers to show you an intrusive igneous rock. Which of the following would you expect to see? (Mark the one best answer.)

• A glassy rock

• A rock with large crystals

• A rock with small crystals

• A rock with large bubbles

Which statement best describes mantle and magma? (Mark the one best answer.)

• Magma is a layer of Earth underneath the crust, and mantle is melted rock within the crust.

• Mantle is a layer of Earth underneath the crust, and magma is melted rock within the crust.

• Magma is a layer of Earth underneath the crust, and mantle is melted rock within the magma.

• None of the above

What feature is the most important in an igneous rock?

• color
• size
• material
• size of crystals

If you see no crystals in a rock, what does that tell you about how it was formed?

• the rocks cooled slowly below the ground and tiny crystals formed
• the rocks were under tremendous heat and pressure so no crystals formed
• the rocks cooled quickly above ground forming crystals too small to see
• no crystals were formed

Where is magma?

• inside 
• outside

How do Intrusive Igneous rocks cool?

• quickly
• slowly
• really fast

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4