Learn what an arroyo or wash is, how it forms, where it occurs, and why these dry desert channels can become dangerous flash floods.
Geology
Learn what geological faults are, how they form, types of faults, key terminology, fault rocks, and their impacts on Earth and people.
Faults in Geology – Definition, Types, and Impacts
How many continents are there? Learn why the number varies and why seven is the most widely accepted model.
How Many Continents Are There?
Learn about erosion in geology. Explore its definition, types, causes, and impact both by and on human activities.
Erosion Definition, Examples, and Causes
Discover what causes earthquakes, what an earthquake is, their different types, and how they are measured. Get free earthquake resources.
What Causes Earthquakes? What Is an Earthquake? Recently updated !
Learn about rivers in geology. Get the river definition, learn how one forms, get examples, and discover interesting facts.
River – Definition, Formation, Facts
Learn about glaciers in geology, including what a glacier is, how one forms, and whether drinking glacial water is safe.
Glacier Facts – What Is a Glacier?
Learn about how mountains are formed and the different types of mountains. Download and print mountain study guides.
How Are Mountains Formed? Mountain Types
Get sinkhole facts in geology. Learn about the different types of sinkholes, how they form, and how to repair or escape from one.