Which one of these is caused by gravity? a. frost wedging. b. mass wasting. c. aeolian bands. d. glaciation

Option (b) is correct.

Explanation:

Frost wedging occurs at extremely cold weather where continuously water seeps into the cracks, freezes and expands causing a break into the rock.

Mass wasting is the downward movement of sand, soil, and rocks due to the force of gravity. Mass wasting occurs because the gravitational force acting on the slope becomes greater than its resisting force.

Aeolian bands are related to the wind force because of which the sand and other particles move form one place to another.

Glaciation is the process of occurrence of glaciers and the formation of shape of the landscape around them.

Thus, it can be concluded that mass wasting is caused by gravity.

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a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.