Rock Types

Which type of rock was the first to exist on the planet?

• igneous

• sedimentary

• metamorphic

Which type of rock forms when an existing rock changes under extreme pressure and intense heat?

• igneous

• sedimentary

• metamorphic

Which type of rock forms through weathering, erosion and deposition?

• igneous

• sedimentary

• metamorphic

Which of the following would be a clue that a rock is igneous?

• It has crystals.

• It has a complete fossil in it.

• It has bands.

• It is very soft.

Which of the following would be a clue that a rock is sedimentary?

• It has gas bubbles throughout.

• It has small particles stuck together.

• It is very hard.

• All of the above

Which of the following would be a clue that a rock is metamorphic?

• It has complete fossils in it

• It has gas bubbles

• It's very soft

• It has ribbon-like layers or bands

Coquina is a rock made of small pieces of broken shells. Ocean waves break seashells into smaller pieces. Over time, these pieces are moved and deposited. When they stick together, they form coquina. Coquina is most likely a(n) ________.

• igneous rock

• metamorphic rock

• sedimentary rock

Diorite is a rock with crystals. It can form when molten lava cools down in the Earth’s crust. Diorite is most likely a(n) ________ rock.

• igneous

• sedimentary

• metamorphic

Quartzite is a rock that can form at the boundaries of tectonic plates. Over time, sandstone buried at the boundary is folded and changed by pressure and heat. The sandstone becomes quartzite. Quartzite is most likely a(n) ________ rock.

• igneous

• sedimentary

• metamorphic

Pumice is a rock that forms during volcanic eruptions from lava that cools very quickly. Pumice is most likely a(n) ________ rock.

• igneous

• sedimentary

• metamorphic