Geologic Time Scale and Events

What principle did Nicolas Steno establish regarding rock layers?

• Layers closer to the surface are older than those below.

• Layers closer to the surface are younger than those below.

• All rock layers are of the same age.

• Fossils determine the age of rock layers, not their position.

What principle did Nicolas Steno establish regarding rock layers?

• Layers closer to the surface are older than those below.

• Layers closer to the surface are younger than those below.

• All rock layers are of the same age.

• Fossils determine the age of rock layers, not their position.

How did William Smith use fossils to determine the relative ages of rock formations?

• He measured the radioactive decay of elements within the fossils.

• He compared the remains of ancient organisms from different rock formations.

• He analyzed the chemical composition of the rock layers surrounding the fossils.

• He used the size of the fossils to estimate the age of the rock.

Which of the following lists the divisions of the Geologic Time Scale from largest to smallest?

• Eras, Eons, Periods, Epochs, Ages

• Eons, Eras, Periods, Epochs, Ages

• Periods, Epochs, Ages, Eons, Eras

• Ages, Epochs, Periods, Eras, Eons

How did William Smith use fossils to determine the relative ages of rock formations?

• He measured the radioactive decay of elements within the fossils.

• He compared the remains of ancient organisms from different rock formations.

• He analyzed the chemical composition of the rock layers surrounding the fossils.

• He used the size of the fossils to estimate the age of the rock.

Which of the following lists the divisions of the Geologic Time Scale from largest to smallest?

• Eras, Eons, Periods, Epochs, Ages

• Eons, Eras, Periods, Epochs, Ages

• Periods, Epochs, Ages, Eons, Eras

• Ages, Epochs, Periods, Eras, Eons

What was a key characteristic of the Hadean Eon?

• It was a period of abundant fossilized life.

• The Earth's atmosphere was rich in oxygen.

• The planet experienced intense volcanic activity and cosmic bombardments.

• Complex multicellular organisms first appeared.

What significant event occurred during the Archean Eon that led to a major change in Earth's atmosphere?

• The formation of the first continents.

• The appearance of photosynthetic cyanobacteria.

• The development of complex multicellular organisms.

• A massive asteroid impact.

What was a key characteristic of the Hadean Eon?

• It was a period of abundant fossilized life.

• The Earth's atmosphere was rich in oxygen.

• The planet experienced intense volcanic activity and cosmic bombardments.

• Complex multicellular organisms first appeared.

What significant event occurred during the Archean Eon that led to a major change in Earth's atmosphere?

• The formation of the first continents.

• The appearance of photosynthetic cyanobacteria.

• The development of complex multicellular organisms.

• A massive asteroid impact.