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A. The plate moving with lesser force subducts under the one moving with greater force.
B. The two plates will both subduct under each other..
C. One of the plates will be forced under the other slightly, but no subduction takes place.
A. Keep changing as plates keep moving.
B. Remain the same until the end of the world.
C. Slowly sink beneath the water surface.
A. To facilitate the study of volcanoes and to send out immediate warnings to others in the near vicinity when the volcano show any signs of erupting.
B. To reap the benefits of volcanoes, like the fertile soil from pyroclastic flows and lava for rich harvest, and minerals for mining.
C. People are unaware of the dangers of living near volcanoes.
Where is the mantle found?
A. Between the crust and the core.
B. The innermost part of the Earth.
C. The outermost part of the Earth.
What are the effects of an earthquake of magnitude 7 on the Richter Scale?
A. Wide cracks appear on the ground, damages buildings and landslides.
B. Concrete structures destroyed, complete devastation of a settlement.
C. Objects drop and vibration is felt by most.
How are plates moved?
A. By convection currents in the Mantle.
B. By compressional forces of the Earth.
C. By the eruptions of lava from volcanoes all around the world.
How can the discovery of coal in cold and dry Antarctica be explained?
A. They were formed underwater and were carried by the waters to Antarctica
B. Antarctica was once part of this 'supercontinent' Pangaea and was was in a warm and humid climate which allowed the formation of coal.
C. Coal was naturally formed in Antarctica together with the ice and glaciers.
What happens at divergent boundaries?
A. Sea floor spreads and magma rises up to fill the gap, forming underwater features like oceanic ridges and submarine volcanoes.
B. Magma rises up and heats up the surrounding water to cause warm tsunamis.
C. A gap is created and surrounding water rushes in to cool the magma into a lower layer of fresh crust.
What can be form at a convergent boundary?
A. Acid lava volcano
B. Shield volcano
C. New crust
Which is the hottest part of the Earth structure?
A. The mantle
B. The core
C. The crust
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