F. Long answer type questions
1. Describe temperature as an element of weather and climate.
2. Increase in the amount of carbon dioxide in the air has caused the temperature of the earth to rise , leading to global warming. What steps we should take to reduce the harmful effect of it . [ value based question ]
3. What is meant by atmospheric pressure? Which factor determines the horizontal distribution of pressure?
4. Write a short note on humidity and precipitation.
5. Explain the three types of winds briefly.
Answers
Answer:
a-1. Temperature is the degree of hotness or coldness of the atmosphere on some chosen scale. It is commonly measured in Celsius or Fahrenheit. Temperature is a very important factor in determining the weather, because it influences other elements of the weather.
a-2. The primary cause of global warming is human activity that releases carbon into the atmosphere, most significantly the burning of fossil fuels to drive cars, generate electricity, and operate our homes and businesses. Tropical deforestation, also by human hands, is another major contributor.
a-3. Factors that affect the horizontal distribution of pressure are: Winds. Seasonal variation. ... Rotation of Earth has its maximum effect on Equator and so is effect of centrifugal force which results into reduction in air pressure.
a-4. Humidity indicates the likelihood for precipitation, dew, or fog to be present. The amount of water vapor needed to achieve saturation increases as the temperature increases. As the temperature of a parcel of air decreases it will eventually reach the saturation point without adding or losing water mass.
a-5. Planetary winds, prevailing winds or permanent winds are those which blow continuously in the same belt all through the year. ... There are three main types of planetary winds - the trade winds, the westerlies and the easterlies. These winds are named according to the direction from which they blow.
Explanation:
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Answer:
ans 1 - Temperature is the degree of hotness or coldness of the atmosphere on some chosen scale. It is commonly measured in Celsius or Fahrenheit. Temperature is a very important factor in determining the weather, because it influences other elements of the weather.
ans 2- Global Warming is definitely the single greatest environmental challenge that the planet earth is facing at present. It is essential to understand the gravity of the situation. The fuel which you use in order to power your homes, cars, businesses and more is heating up the planet faster than expected. We are recording the hottest days and decades ever. What’s alarming is that the temperature of the earth has climbed to the highest point it has ever been in the past 12,000 years. It only gets worse from here if we don’t stop it now.
ans 3 - 1)The 3 main factors that affect barometric (air) pressure are:
Temperature.
Altitude or Elevation.
Moisture ow water vapour
ans 4- Humidity is the concentration of water vapor present in the air. Water vapor, the gaseous state of water, is generally invisible to the human eye.[1] Humidity indicates the likelihood for precipitation, dew, or fog to be present. The amount of water vapor needed to achieve saturation increases as the temperature increases. As the temperature of a parcel of air decreases it will eventually reach the saturation point without adding or losing water mass. The amount of water vapor contained within a parcel of air can vary significantly. For example, a parcel of air near saturation may contain 28 grams of water per cubic metre of air at 30 °C, but only 8 grams of water per cubic metre of air at 8 °C.
ans 5- TYPES OF WINDS - DEFINITION
The various types of winds are:
(1) Permanent or Planetary winds
(2) Periodic winds
(3) Local winds
(4) Cyclones and Anticyclones
LOCAL WINDS - DEFINITION
The local winds are truly local. They occur over a much smaller land scale and are related to the topographical features of that particular place. They blow for a short period and are caused due to the particular shape of the land or nearness to a body of water that generates a specific movement of air.
The examples of local winds in India: Kalbaisakhi (West Bengal), Loo (North India).
PLANETARY WINDS - DEFINITION
Planetary winds, prevailing winds or permanent winds are those which blow continuously in the same belt all through the year. They blow from high pressure belt to low pressure belts. There are three main types of planetary winds - the trade winds, the westerlies and the easterlies. These winds are named according to the direction from which they blow.
ANTI-TRADE OR WESTERLIES - DEFINITION
These are variable winds and not as constant in strength and direction as the trade winds. The westerly wind belt is characterised by frequent cyclones and anti-cyclones. They blow from the subtropical high pressures belt 30
0
north and south of the Equator to the sub polar low pressure belt. In the Northern Hemisphere, they blow from SW to NE. In the Southern Hemisphere, the direction is NW to SE.
CHARACTERISTICS OF POLAR WINDS - DEFINITION
They are more variable in their strength and direction, in the Northern Hemisphere than in the Southern Hemisphere weather disturbances than in the Southern Hemisphere. They blow from the Polar High Pressure belt (90
0
N and S of the Equator) to the sub Polar Low Pressure belt (60
0
N and S of the Equator).
DEFLECTION OF WIND - DEFINITION
The rotation of the Earth causes a force known as the Coriolis Force due to which they deflect more than a slow wind. The change in the wind direction as a result of the coriolis force is stated in Ferrel's Law. This law states that any horizontally moving fluid or object would deflect to the right in the Northern Hemisphere and to its left in the Southern Hemisphere due to the Earth's rotation.
PERIODIC WINDS - DEFINITION
These are the winds blowing at a much smaller scale in comparison to the planetary winds.
The planetary winds include:
(1) Land and Sea Breezes
(2) Monsoons.
SEASONAL WINDS - DEFINITION
Seasonal winds blow in a particular season. These winds have a seasonal rhythm. The best example of this is Monsoon. This season of winds is experienced in southern and eastern Asia. The rapid heating of land due to the hot summer over most parts of India causes the hot air to rise. The winds in the surrounding seas and oceans are moisture laden; they blow in and bring torrential rainfall.
MOUNTAIN AND VALLEY BREEZES - DEFINITION
Mountain and valley breezes form through a process similar to sea and land breezes. During the day, the sun heats up valley air rapidly while mountain remains relatively cooler. Convection causes it to rise, causing a valley breeze. At night, the process is reversed.
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