A trip through Geologic time

What occurred during the Quaternary period when Earth's climate cooled and warmed in cycles?

• Jurassic Period

• Ice Ages

• Titanic

• Mesozoic

What were Earth's first vertebrates called?

• Jawless Fish

• T-rex

• goldfish

• chris cowins

In what era did reptiles and dinosaurs walk the Earth?

• Ice age

• Stone age

• Mesozoic

• Jurassic

What are scientists called that study fossils?

• Meteorologist

• Geologist

• botanist

• Paleontologists

What are fossils?

• molds and casts of organisms that live today

• drawings of ancient animals and other organisms

• footprints or burrows of small animals that live today

• the preserved remains or traces of organisms that lived in the past

What has the study of fossils allowed scientists to do?

• describe past environments and the history of life

• study present ocean temperatures at different depths

• analyze the chemical composition of sedimentary rocks and minerals

• predict which organisms will become extinct in the future

The time it takes for half of the radioactive atoms in a sample of a radioactive element to decay is the elements?

• relative age

• potassium-argon date

• absolute age

• half-life

Geologists use radioactive dating to

• determine the relative ages of rock layers

• tell the difference between and molds and casts

• tell where one soil horizon ends and the next one begins

• determine the absolute ages of rocks

During the Cambrian Explosion that began the Paleozoic Era, the many new forms of life evolved

• lived on land

• were invertebrates that lived in the sea

• were vertebrates that lived with scales or fur

• were single celled

Earth's earliest atmosphere lacked which gas that is necessary for life as we know it to exist today?

• nitrogen

• carbon dioxide

• argon

• oxygen