Earth Science & Climate

Why the Caspian Sea Is Drying Up

What Are Trace Fossils and What Do They Tell Us?

What Algae Fossils Reveal About Earth’s History

Why Do We Always See the Same Side of the Moon?

When Is the Darkest Time of Night?

What Are Hot Spots and What Do They Produce?

Why Are Solar Eclipses More Rare Than Lunar Eclipses?

How Long Do Icebergs Last Before They Melt?

Why Is the Desert So Cold at Night?

What Is Dusk? The Three Phases of Twilight