Science 9th Sem 1 — Sect 3 — Earthquakes/Volcanos

通報

問題一覧

A 5.0 earthquake is approximately ______ times stronger than a 3.0 earthquake

900

Most earthquakes occur ______

At plate boundaries

A cone formed by only solid fragments, built up round of volcanic opening is a _______

Cinder cone

In the process of elastic rebound, as rock becomes stressed, at first ______

Deforms

The volcanoes in Hawaii erupt quietly, with little build up of gases. This is common with. _____

Mafic magma

_______ cools in smooth, ropy textures.

pahoehoe lava

The depression that results when a volcanic cone collapses over an emptying magma chamber is a _____

Caldera

Vibrations in Earth that are caused by the sudden movement of rocks are called _____

Earthquakes

scientists have discovered that before an eruption, earthquakes commonly _____

Increase in number

Which of the following is NOT a method used to forecast earthquake risks?

Determining moment magnitude

Explosive volcanic eruptions commonly result from ______

Felsic magma

Which of the following is NOT a type of seismic wave?

R waves

______ volcanoes are wide, shallow-sloped volcanoes, generally formed from gentle eruptions

Shield volcanoes

S waves cannot pass through _____

Earth's outer core

Pyroclastic materials that form rounded or spindle shapes as they fly through the air are called _____

Volcanic bombs

The primary difference between volcanic ash, lapilli, volcanic bombs, and volcanic blocks, is ______

The size of the object

Areas of volcanism within tectonic plates are called ________

hot spots

A characteristic of lava that determines the force of a volcanic eruption is _______

Viscosity

To fully detect the motion created by an earthquake, a seismograph requires how many sensors?

Which of the following should you NOT do during an earthquake?

If driving, stop in place underneath a bridge or overpass

Science 9th Sem 1 - Secr 1 — scientific inquiries

Science 9th Sem 1 - Secr 1 — scientific inquiries

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