Know the dates of the solstices and equinoxes and the location of the subsolar p

Question

Know the dates of the solstices and equinoxes and the location of the subsolar point at each. Also how to these correspond to seasons and daylengths in the northern and southern hemispheres? altitude? asked to label these. What is average atmospheric pressure at sea level? Does air pressure increase or decrease with Know the ways the atmosphere is classified and the characteristics of each layer. You might be o Classified by Composition: Heterosphere, Homosphere o Classified by Temperature: Thermosphere, Mesosphere, Stratosphere, Troposphere o Classified by Function: lonosphere, Ozonosphere What are the most abundant gases? What is the Normal Lapse Rate? . What does Anthropogenic mean? What is an inversion layer?

Explanation / Answer

2 - atmospheric pressure at sea level is 760 mm of mercury /14.70 pounds per square inch / 101.325 kilopascals.

Air pressure decreases with altitude . ( this is because atmospheric pressure is calculated as the total weight of air above the unit area of elevation . since at higher elevation , the air molecules are reduced over a available surface .

3 - Classification of atmosphere and charactersitics of each layer

3.a - Composition by Temperature - Troposphere is the layer in which most of the surface weather occurs . temperature decreases by 2 degree at every 300 meter interval

Stratosphere - slight increase in the temperature

mesosphere- Temperature again decreases , this is the coldest part of the atmosphere at around180 degree celsius

Thermosphere - Temperature rises above 1000 degree celsius

3b Composition - homosphere - atmosphere is uniformly mixed upto 100 km

Heterosphere - in this layer gases are separated( composition of Nitrogen at 80% and oxygen at 20% does not exsist , it is further sub divided basis the predominant gases

3 c Gravity - Barosphere - below 600 kms gravitu manages the molecular thermal motion and most of the gas is retained in the earth atmosphere.

Exosphere - above 600kms is the exosphere and in this layer the molecules have enough energy to escape earth's atmosphere at the escape velocity of 11km/sec

3d Ionisation - atmosphere starts to become ionised at 70 kms .

Classified by composition : what are the most abundant gases

1- Heterosphere - Nitrogen , hydrogen , oxygen and heliun

2- Homosphere - Nitrogen , oxygen

Classified by Temperature - Thermosphere , Mesosphere, Stratosphere and Troposphere

Normal laspe rate is 6.5 degree celsius per kilometer

Meaning if Anthropogenic - Manmade changes in the nature , this includes the building of roads , houses , emissions of green house gases into the atmosphere .

Inversion layer - This is a layer within which atmospheric property is changed or inverted . ( the change happens from the exsisting normal pattern) this is the layer in which temperature increases with height and decreases with depth ( water temperature with depth)

Solstices and equinox and sub solar point at each location - the sub solar point of december solstice is on Tropic of capricorn and June is on Tropic of cancer . March and September Equinox occurs when subsolar point crosses the equator .

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