Question

2.The height of a place above the sea level is (1)

Answer 1

Answer:

Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.

Answer 2

Answer:

Altitude, like elevation, is the distance above sea level. ... This is called indicated altitude, and is measured by an instrument called an altimeter. As altitude rises, air pressure drops. In other words, if the indicated altitude is high, the air pressure is low.