Earth & Space

How to Date an Arrowhead by Its Type and Location

How to Tell Which Way a River Is Flowing on a Topographic Map

Should We Colonize Space? The Arguments For and Against

Where Is the Tropic of Cancer and What Countries Does It Cross?

Does the Equator Move? The Science of a Shifting Line

What Is It Called When a Stalagmite and Stalactite Meet?

Does 1000 ft Elevation Make a Difference?

When Was the Last Time Mount Rainier Erupted?

How Were the Andes Mountains Formed?

The Galapagos Islands and the Discoveries of Charles Darwin

When Is Orion Visible in the Northern Hemisphere?

What Era Are We Currently In? From Holocene to Information Age

How Much of the Mariana Trench Has Been Explored?

What Natural Disasters Occur at Convergent Plate Boundaries?

When Is Indian Summer in California?

How Long Would It Take to Cross the Milky Way?

How Does Quicksand Actually Kill You?

Where Is Tanzanite Mined? The Only Source in the World

What Is a Monitoring Well and How Does It Work?

Why Is the Middle East So Hot? The Science Explained