What is the largest unit of geological time?

• Eon

• Era

• Period

• Epoch

Which process contributed to the buildup of oxygen in Earth's atmosphere?

• Photosynthesis by plants

• Volcanic eruptions

• Meteor impacts

• Stratales using noxious gases

What major event is associated with the Cambrian period?

• Cambrian explosion

• Dinosaur extinction

• Ice age

• Formation of Pangaea

According to Darwin's theory, what determines the survival of a species?

• Size of the species

• Strength of genes

• Ability to migrate

• Dietary habits

What evidence supports the theory of a meteor impact causing dinosaur extinction?

• Volcanic ash deposits

• Ice core samples

• Fossilized dinosaur bones

• Presence of iridium layer

What are index fossils used for?

• Dating volcanic eruptions

• Identifying rock layers

• Tracking species migration

• Measuring atmospheric changes

Which of the following is a characteristic of index fossils?

• Found in multiple rock layers

• Only found in volcanic ash

• Exist over a large geographic area

• Live for millions of years

What is the significance of volcanic ash in geological studies?

• It changes rock composition

• It indicates volcanic activity

• It contains fossilized organisms

• It serves as a time marker

How do scientists use rock layers to determine the age of rocks?

• By matching them with index fossils

• By checking their mineral content

• By analyzing their color

• By measuring their thickness

What is the primary method for correlating rock layers across different locations?

• Comparing rock color

• Analyzing mineral content

• Matching volcanic ash layers

• Using fossil records