History of Planet Earth

Front

What does 'strata' mean?

Back

Rock layers.

Front

What are the mineralized remains or evidence of plants and animals that lived long ago called?

Back

Fossils.

Front

What do we call fossils found in different locations but in the same layer of rock?

Back

Index fossils.

Front

Which period is the oldest: Cretaceous, Jurassic, Triassic, or Mesozoic?

Back

Triassic.

Front

What type of rock do most fossils come from?

Back

Sedimentary rock.

Front

What is a fossil?

Back

A preserved remnant or impression of a plant or animal from the past.

Front

What is sedimentary rock?

Back

A type of rock formed by the accumulation of sediments.

Front

What is an index fossil?

Back

A fossil that is used to define and identify a particular time period.

Front

What does extinct mean?

Back

When the last member of a species has died.

Front

What is the difference between igneous and sedimentary rock?

Back

Igneous rock is formed from cooled magma or lava, while sedimentary rock is formed from compressed sediments.