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Geophysics is the study of the forces that shape the Earth from a global perspective. Learn about gravity, plate tectonics and other topics.

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What causes high tide and low tide? Why are there two tides each day?

If you go to the beach, you can spend hours watching the waterline rise and fall as the day wears on. There are two of these tides each day, but what causes tides and why are there two of them each day? Find out in this article.


From the Falkland Islands to Colombia: The South American Geography Quiz

 From the Falkland Islands to Colombia: The South American Geography Quiz

How well do you know South American geography? Test your knowledge with this quiz at HowStuffWorks. See more »

The Asian Geography Quiz

 The Asian Geography Quiz

How much do you know about the geography of Asia? Test your knowledge of the Asian continent by taking this quiz at HowStuffWorks. See more »

From the Nile to Cape Town: The African Geography Quiz

 From the Nile to Cape Town: The African Geography Quiz

How much do you know about the land and populations of Africa? Test your knowledge of African geography with this quiz at HowStuffWorks. See more »

The North American Geography Quiz

 The North American Geography Quiz

How much do you know about the geography of North America? Test your knowledge with this quiz at HowStuffWorks. See more »

The Land Down Under: The Australian Geography Quiz

 The Land Down Under: The Australian Geography Quiz

Australia is the smallest continent. Test your knowledge of Australian geography with this quiz at HowStuffWorks. See more »

Falling Fruit and Zero-G's: The Gravity Quiz

 Falling Fruit and Zero-G's: The Gravity Quiz

Gravity governs the structure of the universe. Test your knowledge of this fundamental force with our gravity quiz! See more »

What conditions are required for life?

 What conditions are required for life?

What conditions are required for life? You might be surprised to find out that there's no single definition. Learn more at HowStuffWorks. See more »

Could you dig a hole all the way to the Earth’s mantle?

 Could you dig a hole all the way to the Earth’s mantle?

Could you dig a hole all the way to the Earth’s mantle? Find out how hard it is to dig a hole through the Earth and what you might find. See more »

How the Living Earth Simulator Will Work

 How the Living Earth Simulator Will Work

Could the Living Earth Simulator really reproduce all the systems on earth, including life, climate and more? Read about the Living Earth Simulator. See more »

How Famine Works

 How Famine Works

Famine might bring to mind historical tragedies or tiny children with swollen bellies. But how does famine -- a widespread loss of food -- actually happen? See more »