The correct statements are (b), (c), and (e).
Explanation:
(b) The plates of the outermost layer of the earth are always in continuous motion:
This is true. The Earth’s tectonic plates are constantly moving, albeit slowly, due to the convection currents in the Earth’s mantle.
(c) Tremors on the earth can also be caused by the eruption of a volcano:
Volcanic eruptions can generate seismic tremors as magma rises to the surface.
(e) Bathing outdoors should be avoided during a thunderstorm:
Lightning strikes can be dangerous, so it’s best to avoid being outdoors during a thunderstorm.
Why the other options are incorrect:
(a) Earthquakes occur all the time all over the world:
While earthquakes happen frequently, they are not continuous and they occur more often in certain seismic zones than others.
(d) The process of electric discharge cannot occur between clouds and the earth:
This is false. The buildup of electrical charges in clouds can lead to discharges to the Earth, causing lightning.