Question

Mark the following statements as true or false and correct the false statements.
(a) Earthquakes and tsunamis are difficult to predict.
(b) Tsunamis always follow earthquakes.
(c) Tall buildings should be built on solid ground and not on loose surface materials.
(d) People living in coastal areas should always be prepared to move if earthquakes happen nearby.
(e) The epicentre is the point inside the earth where the earthquake originates.
(f) A nuclear disaster is a natural disaster.
(g) A seismograph is a scale used for measuring the magnitude of earthquakes.
(h) Hot molten rock that flows out of volcanoes is called magma.

Answer 1

(a) True
(b) False. A tsunami follows an earthquake when tectonic plates slip in the ocean and a huge amount of water is displaced.
(c) True
(d) True
(e) False. The point inside the earth where an earthquake originates is called the focus or hypocentre of the earthquake.
(f) False. A nuclear disaster is man-made, and is caused mainly because of an accident in a nuclear power plant.
(g) False. The Richter scale is used for measuring the magnitude of earthquakes.
(h) False. The hot molten rock that flows out of a volcano is called lava, and the hot molten rock inside the earth's crust is called magma.