1. The most common type of volcanoes are also usually the smallest. ______________ produce a lot of ash, which often cools rapidly and forms a cone-shaped mass of rock made of hardened cinders and ash. The largest volcanoes are ________________, and are made almost entirely of lava flows. These low, broad volcanoes are typical of the ones found in Hawaii. The most violent explosions usually come from ____________________, which are made from alternating layers of cinder rock and hardened lava.
2. Vibrations caused by earthquakes can be measured by a ____________. Vibrations the earth's crust are also known as __________________ , which are produced during a earthquake. The point where the energy in an earthquake is first released is the ______________. The record that a seismograph makes is called a ___________________ and is made up of a series of zigzag lines.
2007-01-25
05:37:36
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9 answers
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Anonymous
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Science & Mathematics
➔ Earth Sciences & Geology
3. Three kinds of seismic waves are produced by earthquakes. The first to arrive are the
_________________, which are also known as P waves.They travel fastest, and able to pass through _________, _________, and gases. Next come ____________, also known as S waves. They cannot pass through ___________. The slowest waves are L waves, which travel on the surface of the earth and are so called ____________. The difference between the arrival times of S and P waves can tell us how far way an earthquake is. The ___________ the time between them means the earthquake's _________________ was further away.
2007-01-25
05:38:04 ·
update #1