From NationalGeographicVideo, produced by National Geographic
Witness the destructive power of earthquakes, from home videos taken during a tremor. Video goes inside the Earth to show how an earthquake starts. Earth is covered by plates, when the plates are moved by the heat of the inner Earth, they grind against each other along lines called faults. When the plates motion is blocked stress builds up, finally the fault gives way. The released energy moves through the Earth called seismic waves. Seismic waves are measured by scientists on seismographs. Only about a thousand of these waves is strong enough to cause damage. About 10,000 people die each year in earthquakes. The strongest earthquake to date in North America measured 9.2, and was in Alaska on March 28, 1964. Video is good quality and has good information. Good for elementary grade and middle school students.
|
Ages:
9 - 16
|
|
License:
Proprietary
|
|
Owner:
National Geographic
|
|
Found by
Barb
- Unless changed, the Finder is the person who uploaded the video to WatchKnowLearn.
-
The Finder is allowed to "lock" information about the Owner and Producer (so other accounts cannot edit this information).
The Finder field should match the Owner field when a video is entered in a contest.
- As owner of a video, you can have finder rights transferred to you.
Simply click "Request Finder Rights" and an e-mail will be sent to the current Finder of the video. The Finder may then transfer
rights to you. If he or she does not, bear in mind that an Administrator will see the refusal of your request and will be able to
review it.
More help about the Finder field
|