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問題一覧
1
A 5.0 earthquake is approximately ______ times stronger than a 3.0 earthquake
900
2
Most earthquakes occur ______
At plate boundaries
3
A cone formed by only solid fragments, built up round of volcanic opening is a _______
Cinder cone
4
In the process of elastic rebound, as rock becomes stressed, at first ______
Deforms
5
The volcanoes in Hawaii erupt quietly, with little build up of gases. This is common with. _____
Mafic magma
6
_______ cools in smooth, ropy textures.
pahoehoe lava
7
The depression that results when a volcanic cone collapses over an emptying magma chamber is a _____
Caldera
8
Vibrations in Earth that are caused by the sudden movement of rocks are called _____
Earthquakes
9
scientists have discovered that before an eruption, earthquakes commonly _____
Increase in number
10
Which of the following is NOT a method used to forecast earthquake risks?
Determining moment magnitude
11
Explosive volcanic eruptions commonly result from ______
Felsic magma
12
Which of the following is NOT a type of seismic wave?
R waves
13
______ volcanoes are wide, shallow-sloped volcanoes, generally formed from gentle eruptions
Shield volcanoes
14
S waves cannot pass through _____
Earth's outer core
15
Pyroclastic materials that form rounded or spindle shapes as they fly through the air are called _____
Volcanic bombs
16
The primary difference between volcanic ash, lapilli, volcanic bombs, and volcanic blocks, is ______
The size of the object
17
Areas of volcanism within tectonic plates are called ________
hot spots
18
A characteristic of lava that determines the force of a volcanic eruption is _______
Viscosity
19
To fully detect the motion created by an earthquake, a seismograph requires how many sensors?
3
20
Which of the following should you NOT do during an earthquake?
If driving, stop in place underneath a bridge or overpass