Unit Exam Review pt.3

Where does the heat that drives convection currents come from?

• The sun

• Friction

• Gravity

• Radioactive isotopes deep in the mantle

According to the diagram, the fossils in which layer are the youngest?

• A

• B

• C

• D

Which sentence is true about fossils?

• Most organisms that die are preserved as fossils

• Fossils can include footprints, eggs, or other traces of organisms

• Most fossils form in metamorphic rock.

• Fossils cannot indicate what an organism ate.

Radiometric dating is possible because the rates of decay of radioactive isotopes _____.

• change over time
• change from place to place
• are constant
• vary widely

The process by which water, ice, wind, or gravity moves weathered rock and soil from one place to another.

• Weathering
• Erosion
• Deposition
• Crop Rotation

Which of the following best describes an index fossil?

• A fossil that is used to identify and date the rock layer in which it is found

• A fossil that is used to determine the absolute age of rocks

• A fossil that is found in many rock layers

• A fossil that is found in only one location

What is the age of Earth?

Deposition changes the Earth’s surface because bits of broken rock and soil _____.

• stop rivers from flowing.
• make rich farmlands.
• are dropped in new places.
• move very slowly.

What is the process that picks up and moves weathered rocks?

• Deposition
• Landslide
• Weathering
• Erosion

Limestone is a type of sedimentary rock formed from the remains of shelled marine life. Finding limestone in a specific area helps scientists understand what information about the history of that area?

• The area used to be a forest

• The area used to be underwater

• The area was a desert

• The area has not changed over time