4. Which one of the following types of volcanoes would be the most explosive?
A. Volcanoes that contain small amounts of water
B. Volcanoes that have thin magma
C. Volcanoes that contain small amounts of carbon dioxide
D. Volcanoes that have large amounts of silica
12. Suppose the highest point in a landscape is 2,000 meters above sea level. The lowest point in the same landscape is 500 meters. The relief of this landscape is _______ meters.
A. 400
B. 1,500
C. 2,500
D. 10,000
2006-11-14 19:43:22 · 2 answers · asked by blazin_cripz_2006_0wner.sheena 3 in Science & Mathematics ➔ Earth Sciences & Geology
4. D
The most explosive volcanoes are those containing a lot of silica. The shape of the silca molecule is a bit like a pyramid which means that cannot move past each other very easily. This makes them very viscous and so it takes much more energy to get it to move and the energy comes out in a single event.
12. B
It's the difference between min and max.
2006-11-15 01:49:30 · answer #1 · answered by andrew w 3 · 0⤊ 0⤋
E!
2006-11-14 19:48:07 · answer #2 · answered by JOhNe=mc² 6 · 0⤊ 1⤋