O State whether the following statements are True (T) or False
Hoat radiations require a medium for propagation
The height of a place above sea level is called atmosphere
3. Sunrise and sunset do not vary around the globe
Biological weathering occurs because of the root of plants and trees and
animals inside the soil
5. The topmost layer of soil is the R-zone
6 Spiracles are tiny holes in cockroaches through which enters
G Name the following.
The mode of conduction of heat with the actual movement of the parties in the
The SI unit of temperature
The measure of heat content of the atmosphere
the instrument used to measure humidity in percentage
Answers
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Answer:The gaseous canopy that envelops the lithosphere and the hydrosphere is known as the atmosphere. It consists of a mixture of various gases and is believed to extend about 10,000 km above sea level. Held to the earth by gravitational attraction, the atmosphere has its maximum density at sea level and decreases rapidly upward.
Recent observations show that about 97 per cent of the atmosphere is confined within 29 km of the earth’s surface.
Air is a mechanical mixture of gases, not a chemical compound. Of the many constituting gases, Nitrogen (N2), Oxygen (O2), Argon (Ar), and Carbon-dioxide (CO2), account for nearly 99-98% of the air by volume. Observations made by rockets show that these gases are mixed in remarkably constant proportion up to an altitude of about 80 km. In addition to these gases, other gases, water vapour and aerosols are also present in the air.
Explanation: