Friday , September 18 2020

# NCERT 7th Class (CBSE) Social Science: Elements of Weather and Climate

#### Question: Distinguish between Weather and climate.

Weather
Climate
1. It is the general atmospheric condition of a day.
1. It is the sum total of weather conditions and variations over a long period of time (30 years or more)
2. It can change every day.
2. It does not usually change much.
3. It is the average record of atmospheric temperature, atmospheric pressure and rainfall over a small area on a daily basis.
3. It is the aggregate of atmospheric temperature, atmospheric pressure and rainfall over a large area over 30 years or more.
4. Described as hot, cold, sunny, cloudy, windy, dry, wet etc.
4. Described as equable, extreme, tropical, temperate etc.

#### Question: Distinguish between Heat and Temperature, Convection and Advection and Latitude and Altitude

Heat
Temperature
1. Heat is the form of energy.
1. The hotness and the coldness of a substance is called temperature.

Convection
1. The transfer of heat through the movement of rising up of warm air and sinking of cold air is called convection.
1. It is the transfer of heat from one region to the other.
2. Massive convection currents are formed over the Earth, which transfer heat from the earth to the upper parts of the atmosphere.
2. Advection usually involves the large scale horizontal transfer of energy. For example- when cold polar winds mix with and cool the warmer air of the tropic.

Latitude and Altitude

Latitude
Altitude
1. Latitude is the distance, measured in degrees, minutes and seconds, north and south from the Equator.
1. Altitude is the distance, measured in feet or meters, above (or, in rare instances, below) mean sea level
2. Lower the latitude higher is the temperature.
2. Temperature decreases with increase in altitude.

## Motion and Time: 7th Class NCERT CBSE Science Ch 13

Motion and Time 7th Class NCERT CBSE Science Chapter 13 Question: Give the basic unit of speed. …

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1. Sahil Singh Rawat