Earth's History Review

Earth’s rocks and other materials provide a _______ of earth’s history

• record

• prediction

• guess

Earth’s history can be interpreted from the ______________.

• Geological time scale

• Locations of the oceans

• Earth’s rotation around the sun

• Habitats

The current geological time era, called the Cenozoic Era, gave rise to these species.

• Mammals

• Dinosaurs

• Trilobites

• Eukaryotes

The age of the Earth is __________

• 4.5 billion years old

• 3.5 billion years old

• 4.5 million years old

• 4.5 trillion years old

Relative dating is

• Oldest rock strata at the bottom, youngest strata at the top.

• The process of finding a numeric age of rocks or fossils using radiometric dating.

• Have a different number of neutrons

• How long it takes for half of the isotopes to break down

• It is used to measure previously living things.

Absolute dating is

• The process of finding a numeric age of rocks or fossils using radiometric dating.

• Oldest rock strata at the bottom, youngest strata at the top.

• Have a different number of neutrons.

• How long it takes for half of the isotopes to break down.

• It is used to measure previously living things.

What is an Isotope?

• Have a different number of neutrons.

• Oldest rock strata at the bottom, youngest strata at the top.

• The process of finding a numeric age of rocks or fossils using radiometric dating.

• How long it takes for half of the isotopes to break down.

• It is used to measure previously living things.

What is a half-life?

• How long it takes for half of the isotopes to break down.

• Oldest rock strata at the bottom, youngest strata at the top

• The process of finding a numeric age of rocks or fossils using radiometric dating.

• Have a different number of neutrons.

• It is used to measure previously living things.

Carbon-14 is

• used to measure previously living things.

• how long it takes for half of the isotopes to break down.

• made of a different number of neutrons.

• how long it takes for half of the isotopes to break down.

Stratigraphy is the study of

• Rock strata

• Beginning of life

• Fossil Formation

• DNA