Earth's History

88% of Earth's history is

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

What time do we live in?

The Cenozoic is known as the age of ___________

Most of the species during the __________ we spineless

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

This time included ice ages, changing landforms, and the appearance of humans

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

During this time the Earth was mostly molten minerals - continents were just starting to form

What do scientists call the time when many new, spineless species first appeared?

• Cambrian Eon

• Invertebrate Explosion

• Age of Reptiles

• Mammalian Explosion

When dinosaurs were no longer the main species, the ____ ended

What resulted when many organisms began making their own food by photosynthesis?

• Water vapor began condensing

• Meteor impacts began to slow

• Oxygen the atmosphere increased

• Mass extinctions occurred

The last supercontinent was called

• Laurentia

• Abyssinia

• Pangea

• Gondwana