Strata Fossil Review

What needs to happen FIRST for a fossil to form?

• A plant or animal must be covered by sediment

• A plant or animal must die and decompose

• Sediments fill a mold to form a cast

• An earthquake shifts the land up

What needs to happen SECOND for a fossil to form?

• A plant or animal must be covered by sediment.

• A plant or animal must die and decompose

• Sediments fill a mold to form a cast

• An earthquake shifts the land up.

What can we infer about animals with dull teeth?

• They ate other animals

• They ate only plants

• They are sea creatures

• They only ate fish

What is the correct listing of steps for a fossil?

• 1) Pressure created a rock

  2) Plant or animal is buried

  3) Plant or animal is left alone for years

  4) Plant or animal dies

• 1) Plant or animal dies

  2) Plant or animal is left alone for years

  3) Pressure created a rock

  4) Plant or animal is buried

• 1) Plant or animal dies

  2) Plant or animal is left alone for years

  3) Plant or animal is buried

  4) Pressure created a rock

• 1) Plant or animal dies

  2) Plant or animal is buried

  3) Plant or animal is left alone for years

  4) Pressure created a rock

Where are most fossils formed?

• near volcanoes, because the high heat of the lava helps form the fossils

• in glaciers, because fossils are created when an organism is frozen quickly

• in sedimentary rock, because being buried in sediment helps to form fossils

• near earthquakes, because the shaking ground traps organisms to create fossils

The picture shows a tooth fossil of the extinct

Megalodon shark (Black) next to teeth (white) from a great white

shark, which is still found today.

Which of the following best explains the

difference in the size of the teeth?

• Sharks were once larger than the sharks that are living today.

• The fossilized tooth was filled with water, which made it grow in size.

• Sharks alive today do not live long enough to grow very large teeth.

• The fossilized tooth had extra sediment around it, which became a part of it

Comparing one object to another in order to determine the approximate age of a rock is termed

• Absolute Dating

• Relative Dating

Finding the age of a rock or fossil without comparing it to another is termed

• Absolute Dating

• Relative Dating

How does absolute age differ from relative age?

• only absolute dating indicates which rock is older than another

• 
  only absolute dating finds the age in years

• only relative dating finds the age in years

Rocks formed when sediments are eroded and eventually become deposited in layers .

• Igneous

• Sedimentary

• Metamorphic