Exam 1: The Origin of the Ocean

The average depth of the ocean is approximately ____.

The average land elevation on Earth is greater than the average depth of the ocean.

Our sun and its family of planets were formed about _____.

To recreate an environment for biosynthesis, scientists included which element in their experiments?

There is convincing evidence that water once flowed on the surface of Mars.

Evidence suggests the universe began about 13.7 billion years ago in a ____.

Describe the general steps involved in the scientific method.

Describe the basic processes and timeline that led to the formation of Earth and its ocean and atmosphere.

What is meant by a "single world ocean"?

In the scientific method, scientific theories must be ____.

Carbon-based residues found in rocks near Greenland suggest that the first life forms on Earth may have arisen ____.

What theory best explains how the universe was formed?

The primary physical process responsible for the formation of Earth's layers, the inner and outer core, mantle, and crust is ____.

Describe the big bang theory.

Scientists predict that our planet in its current form will exist for about another ____.

The ocean holds more than 97 percent of Earth's water.

An example of another body in our solar system that has an ocean is ____.

A galaxy is a huge rotating aggregation of stars, dust, gas and other debris held together by ____.

Gravity was important in the formation of our planet because it pulled dense metals such as iron and nickel inward, forming Earth's core.

Deep-sea fossils suggest that life evolved within the last million years.