Rocks as Clues to the Past

What are the clues that tell us about the Earth's past?

• weathering, erosion, and deposition

• type and age of rocks, glacial striations, and fossils

• rocks, animals, and plants

• rocks, glaciers, and fossils

Weathering is...

• the movement of sediments from one place to another by some kind of force.

• the process where eroded sediments are deposited in another place.

• the process that breaks down rocks into smaller pieces called sediments.

• the changing of temperature.

Erosion is...

• the movement of sediments from one place to another by some kind of force.

• the process that breaks down rocks into smaller pieces called sediments.

• the process where eroded sediments are deposited in another place.

• the changing of landforms.

Deposition is...

• the changing of rocks.

• the process that breaks down rocks into smaller pieces called sediments.

• the movement of sediments from one place to another by some kind of force.

• the process where eroded sediments are deposited in another place.

Which one is correct?

• Weathering takes it. Erosion drops it. Deposition breaks it.

• Weathering drops it. Erosion breaks it. Deposition takes it.

• Weathering breaks it. Erosion takes it. Deposition drops it.

• None of the above.

Which one is NOT a type of rock?

• metamorphic rocks

• igneous rocks

• metasomatic rocks

• sedimentary rocks

When studying rocks, what do scientists look at to learn what conditions were like on Earth at the time the rocks were formed?

• mineral composition and age of rock

• mineral composition and type of rock

• type and age of rock

• mineral compositions of the rock only

What do "striations" mean?

• scratches

• lines

• trenches

• deposits

What do glacial striations in a specific area tell us?

• That dinosaurs existed in that area.

• That there are fossils around.

• That an asteroid hit that area in the past.

• That glaciers existed in that area.

Glaciers are...

• icebergs.

• gigantic sheets of ice that does not move.

• huge, slow-moving sheets of ice.

• giant, melting ice.