Earth's History Review

Which best describes a fossil that helps determine the relative age of a rock layer?

• trace fossil
• index fossil
• radioactive fossil
• unconformity fossil

Which is the most accurate method scientists can use to estimate Earth's age?

• relativism
• superposition
• relative dating
• radioactive dating

Fossil remains of a trilobite are most likely to be found in which type of rock?

• igneous
• volcanic
• sedimentary
• metamorphic

The longest subdivision of time

• Eon
• Era
• Epoch
• Extinct

According to the law of superposition, which layer is the youngest?

• A
• B
• C

According to the law of superposition, the oldest fossils are found 

• At the top of the rock layers
• Near the bottom of the rock layers
• In the middle of the rock layers
• Somewhat near the surface

What era did the dinosaurs live in?

• jurassic

• cretaceous

• mesozoic

• triassic

What event occurred the earliest in geologic history?

• appearance of the earliest grasses

• appearance of the earliest birds

• the grenville orogeny

• abundant reptiles

what statement about dinosaurs is correct?

• they were the first land animals

• they developed from early mamals

• they were abundant during the start of the ice age

• they became extinct before the neocene period

how many half lives occurred if a fossil was found to contain 25% of its original carbon-14?

• 1

• 2

• 3

• 4