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How the Mohs Scale Ranks Hardness

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The Mohs hardness scale is used by geologists and gemologists as a way to help identify minerals using a hardness test. How does it work?

How Does a Seismograph Work?

science.howstuffworks.com/environmental/earth/geophysics/question142.htm

A seismograph can accurately measure the movement of the Earth during a quake. How does a seismograph work, though, and what is the Richter scale that is associated with earthquakes? Learn the answers to these questions in this article.

What Would Happen if the Earth Stopped Rotating?

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You can say goodbye to the seven continents and hello to days that seem infernally long. What else awaits you on a spin-free Earth?

How Supervolcanoes Work

science.howstuffworks.com/nature/natural-disasters/supervolcanoes.htm

Only a few natural events pack the power to knock global civilization on its heels. One is a planet-killing meteor. Care to guess the other?

How Earthquakes Work

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An earthquake is one of the most terrifying phenomena that nature can dish up. We generally think of the ground we stand on as "rock-solid" and completely stable. An earthquake can shatter that perception instantly, and often with extreme violence.

What Causes the Tectonic Plates to Move?

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Discover the origins of the continental drift theory and how scientists explain these geologic phenomena.

What Was the Strongest Earthquake Ever Recorded?

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Earthquakes are among the most powerful natural forces on Earth, often causing widespread devastation, triggering tsunamis and altering the landscape of a region. But how strong was the strongest earthquake of all time?

How much energy in a hurricane, a volcano, and an earthquake?

science.howstuffworks.com/environmental/energy/energy-hurricane-volcano-earthquake.htm

Energy has been on everybody's minds lately, probably because our society is in a transition period, trying to move from polluting sources to cleaner ones.

15 Worst Hurricanes of All Time

science.howstuffworks.com/nature/natural-disasters/10-worst-hurricanes.htm

The Americas have been hit with some major hurricanes throughout the decades. But which were the worst ones in history?

Turns Out Earth's Pulse 'Beats' Every 27.5 Million Years, But Why?

science.howstuffworks.com/environmental/earth/geophysics/earths-pulse.htm

Researchers have been asking this question for almost a century and now we're a little closer to the answer. Something else to ponder: Every 27.5 million years there is usually a mass extinction.

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