Earthquake epicenter, Volcanoes and Mountain Ranges

What do we call the continuously moving part of the earth’s crust?

• Fault

• Fissure

• Fracture

• Plate

Answer explanation

Tectonic plates are pieces of Earth's crust and uppermost mantle, together referred to as the lithosphere. The plates are around 100 km (62 mi) thick and consist of two principal types of material: oceanic crust (also called sima from silicon and magnesium) and continental crust (sial from silicon and aluminium).

Which theory states that the entire crust is broken and is continuously moving?

• Continental Drift

• Plate Tectonics

• Seafloor Spreading

• Titanic Theory

Answer explanation

The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle.

Which of these phrases is FALSE about lithospheric plates?

• have the same thickness everywhere

• include the crust and upper mantle

• thickest in the mountain regions

• vary in thickness

What should you NOT DO during an earthquake?

• cover your head

• duck under the table

• park your car

• run to a tall tree

Why is it important to be aware of places prone to earthquakes?

• to identify what crop must be stored

• to identify when to evacuate

• to locate where to stay best

• to perform necessary precautions

Where are most volcanoes situated?

• along fault lines

• concentrated on continental edges

• near mountain ranges

• under the oceanic crust

Answer explanation

Most volcanoes form along plate boundaries. Volcanoes are common along tectonic plate boundaries where oceanic plates sink beneath other plates. As a plate sinks deep into a subduction zone, it heats and begins to melt, forming magma. If the magma reaches the surface it can build tall volcanic mountains.

How do you describe the locations of earthquake epicenters, mountain rangers, and moving plates in the Pacific Ring of Fire? They are _____.

• all over the place

• concentrated in one area

• located in the same location

• strategically plotted in clusters

When you see that the ocean water is receding (disappearing) away from the beach, you MUST

• call the police

• run to the nearest hill or mountain

• stay in the middle of the beach

• take the time to pick up seashells

What do you think is the basis of scientists in dividing Earth’s lithosphere into several plates?

• brightness of stars and formation of constellations in the sky

• a cycle of high and low tides during full moon

• the occurrence of earthquake, volcanism and mountain formation

• the uneven distribution of heat in the globe

How will you relate the distributions of mountain ranges, earthquake epicenters and volcanoes?

• Mountain ranges are found in places between where volcanoes and earthquake epicenters are also situated.

• Mountain ranges are found in places where volcanoes and/or earthquake epicenters are also situated.

• Mountain ranges are found only in places where earthquake epicenters are situated.

• Mountain ranges are found only in places where volcanoes are situated.