A sandstone formation known as a Beehive in the Valley of Fire Nevada State Park. This formation occurs from wind and water erosion. Photo: Alex Demas, USGS. Public domain.

What are Two Main Causes of Changes to the Earth Surface?

Joe Akintola

Erosion and weathering are two forces that change the surface of the Earth over thousands and millions of years.

Continental Divides in North America.

What is a Continental Divide?

Joe Akintola

A continental divide is seen as any natural (not man-man) boundary separating precipitation.

Vredefort Dome, Free State, South Africa.

Geography of Impact Craters

Caitlin Dempsey

According to the Earth Impact Database, there are currently 184 verified impact craters that have been documented on Earth.

Photograph of the eruption from the summit of Eyjafjallajökull from the north looking to the south across the Gígjökull outlet glacier, its "missing" proglacial (ice-margin) lake caused by the jökulhlaup that filled in the lake. Photo: Oddur Sigurðsson, Iceland Meteorological Office. Public domain.

Volcanoes and Glaciers in Iceland

Elizabeth Borneman

Iceland is a country of varied geography, topography, and landscape.

View of Zoroaster Temple from the El Tovar Hotel in the Grand Canyon. Photo: Michael Quinn, NPS, Public Domain.

The Grand Canyon

Elizabeth Borneman

The Grand Canyon is one of America’s most beloved and well-known geographical wonders and is visited by millions of people every year.