8th Grade Science Semester 1 Cumulative Review

Front

What type of force is gravity?

Back

Noncontact force.

Front

What can be inferred if rock layer C is the oldest and rock layer A is the youngest?

Back

Rock layer C was formed first.

Front

What are the remains of living plants or animals called?

Back

Fossils.

Front

How do eons and eras differ from hours and minutes?

Back

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

Front

Do most mutations occur randomly?

Back

True.

Front

What is the definition of a noncontact force?

Back

A force that acts at a distance without physical contact.

Front

What is the principle of superposition in geology?

Back

In undisturbed rock layers, the oldest layers are at the bottom and the youngest are at the top.

Front

What is a fossil?

Back

The preserved remains or traces of a once-living organism.

Front

What is the difference between a scientific theory and a scientific law?

Back

A theory explains why something happens, while a law describes what happens.

Front

What is the role of natural selection in evolution?

Back

Natural selection is the process where organisms better adapted to their environment tend to survive and produce more offspring.