Earthquake Testing
Scientists are using the world's largest "shake table" to test new construction methods for buildings in areas prone to earthquakes. They believe they have devised a system to build taller, wood-frame buildings that can still safely withstand even very powerful tremors.
Right-click (Windows) or Option-click (Mac) here to download a copy of this video in QuickTime format.
You might also be interested in:
The ground underfoot might seem like it's not going anywhere but it is. It moves. If it moves all of a sudden the ground shakes. That's an earthquake! Earthquakes happen as pieces of the Earth's crust
...more
During an earthquake, the ground shakes making it difficult or impossible to stand up without falling. The land can also roll in waves - sinking in some places and rising in others. How does all this moving
...more
Many forces change the surface of the Earth over time. The largest force that changes our planet's surface is movement of Earth's outer layer in a process called plate tectonics. As shown in this picture,
...more
Altocumulus clouds are part of the Middle Cloud group. They are grayish-white with one part of the cloud darker than the other. Altocumulus clouds usually form in groups. Altocumulus clouds are about
...more
Altostratus clouds belong to the Middle Cloud group. An altostratus cloud usually covers the whole sky. The cloud looks gray or blue-gray. The sun or moon may shine through an altostratus cloud, but will
...more
Cirrocumulus clouds belong to the High Cloud group. They are small rounded puffs that usually appear in long rows. Cirrocumulus are usually white, but sometimes appear gray. Cirrocumulus clouds are the
...more
Cirrostratus clouds belong to the High Cloud group. They are sheetlike thin clouds that usually cover the entire sky. The sun or moon can shine through cirrostratus clouds. When looking at the sun through
...more
