Geologic time

Which scientific idea explains Earth's history as a series of disastrous events that occurred over short periods of time?

• catastrophism

• cross-cutting relationships

• uniformitarianism

Which scientific principle states that geologic processes that occur today are similar to those that have occurred in the past?

• uniformitarianism

• catastrophism

• lateral continuity

The actual age of geologic event is the ​ ​ (a)  

A stack of books rests on the floor. Using the concept of relative-age dating, the book on the bottom of the stack was the first book to be placed on the floor.

• True

• False

An early scientific idea called (a)   explains Earth's history as a series of disastrous events that occurred over short periods of time.

The principle of (a)   states that geologic processes that occur today are similar to those that have occurred in the past.

The concept of ______________________ is the basis for understanding Earth's past.

• Magma

• fossils

• geology

• uniformitarianism

Which is an example of relative-age dating?

• In a pile of fallen leaves, the last leaves to fall from a tree will be found on the bottom of the pile.

• In a pile of fallen leaves, the last leaves to fall from a tree will be found in the middle of the pile.

• In a pile of fallen leaves, the last leaves to fall from a tree will be found on the top of the pile.

What is the age of rocks and geologic features compared with other rocks and geologic features nearby?

• relative age

• geologic age

• absolute age

Which concept is the basis for interpreting Earth's past?

• uniformitarianism

• evolution

• catastrophism