Earth History

What is an index fossil?

• A fossil that is extremely rare and found only in one location.

• A fossil that is used to define and identify geological periods.

• A fossil that is younger than 10,000 years.

• A fossil that can be used as fuel.

Which ocean zone is characterized by complete darkness and is found at depths below 1000 meters?

• Epipelagic Zone

• Mesopelagic Zone

• Bathypelagic Zone

• Midnight Zone

What era is known as the "age of the reptiles"?

• Paleozoic

• Mesozoic

• Cenozoic

• Proterozoic

What is the primary method by which scientists determine the age of fossils?

• Carbon dating

• Observational inference

• Comparative anatomy

• Genetic testing

Which period is directly below the Jurassic in the geological time scale?

• Triassic

• Cretaceous

• Permian

• Devonian

Which ocean is the largest and deepest on Earth?

• Atlantic Ocean

• Indian Ocean

• Pacific Ocean

• Arctic Ocean

What is the primary characteristic that defines an organism as an index fossil?

• It must be widespread geographically.

• It must be difficult to find.

• It must be visually distinctive.

• It must be from the current geological period.

Which of the following best describes the Cenozoic era?

• Age of Fishes

• Age of Amphibians

• Age of Mammals

• Age of Dinosaurs

What is the primary factor that affects the distribution of life in different ocean zones?

• Salinity

• Temperature

• Light availability

• Oxygen content

During which geological period did the first vertebrates appear?

• Cambrian

• Ordovician

• Silurian

• Devonian