Book 1 Module 1 (8th)

The Geologic Species Scale has unites based on changes in rocks and fossils

• True

• False

Index fossils are the remains of species that existed on Earth for relatively short periods of time.

• True

• False

What classification of unconformity occurs when sedimentary rock overlies igneous rock?

• disconformity

• nonconformity

• angular unconformity

• conformity

The gap in the rock record that occurs between folded or uplifted rock layers and sedimentary rock layer on top of them is called a(n) ____________.

• disconformity

• nonconformity

• angular unconformity

• conformity

What is one reason the presence of iridium leads scientists to hypothesize that a meteorite impact caused the mass extinction of dinosaurs?

• There are no fossils of dinosaurs in rocks below the iridium layer.

• Iridium is only common on Earth and is never found in meteorites.

• All dinosaur fossils contain iridium.

• There are no fossils of dinosaurs in rocks above the iridium layer.

How is the relationship between eons and eras different than the relationship between hours and minutes?

• Eras are made up of eons, but hours are made up of minutes.

• Eons are made up of eras, but minutes are made up of hours.

• Eras are not even divisions of time, while minutes are.

• Eons are even divisions of time, while hours are not.

A geologist who needed to correlate two rock formations in different areas could match exposed rock layers.

• True

• False

When part of the rock record is destroyed, the erosional gap that forms is a(n) ____.

• Inclusion

• Key Bed

• Unconformity

• Superposition

Rock layers are correlated if they both contain the same ____.

• elements

• shapes

• fossils

• pore spaces

An unconformity between two sedimentary layers is classified as a disconformity.

• True

• False