Why did earthquakes need fault line? (A) because those are the places where the plate tectonics are found (B) because those are the places where the Earth's crust is found (C) Because those are the spots where there is movement in the crust (D) Because those are the spots where the lava comes up to the curst.

Explanation:

Earthquakes usually occur where two plates are running into each other or sliding past each other. Figure 1 - An image of the world's plates and their boundaries. ... Faults are caused by all that bumping and sliding the plates do. They are more common near the edges of the plates.

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.

explanation: no but i do not usually comment