Question 61
about 1 earthquakes with a richter magnitude of 4 will occur in a year.
question 61 options:
true
false
question 63
orogenesis is the term used to describe the formation of oceans and basins.
question 63 options:
true
false
question 64 (1 point)
the crust is less dense than the mantle and the continental crust is less dense than oceanic crust.
question 64 options:
true
false
question 66 (1 point)
oceans cover approximately of earth's surface area.
question 66 options:
25%
50%
90%
70%

Q. 61  True,  Q.63.  True   Q.64.  True   Q.66.  71%      

Explanation:

its provided in the richter scale that the earthquakes of magnitude of 4 occur every 10,000 times in a year.

Orogenesis is a process of mountain building through the formation of ocean basins and plate tectonics.

The continental crust or the plates are composed of SIAL i.e SIlicon and aluminium i.e light and less dense than the below oceanic plates.

Majority of the earth is made up of water i.e 71 percent and rest 29% is water i.e Land vs Water ratio.