Question 1

Which radiation is emitted from Earths surface both day and night?

Accepted Answer

Terrestrial radiation Earths surface continuously emits longwave heat. In exams understand terrestrial radiation as a continuous process.

Question 2

Why is Earths heat budget considered balanced in the long term?

Accepted Answer

Because energy input and output remain nearly equal Over the long term Earth loses nearly as much energy as it receives. In exams remember long term balance.

Question 3

What is the general meaning of energy surplus?

Accepted Answer

Received energy is more than lost energy The direct answer is A: received energy is greater than lost energy. An energy surplus means that, during the period being considered, energy entering a system exceeds energy leaving it. Step by step: compare incoming energy with outgoing energy; if incoming energy is larger, the difference is a surplus; the system stores extra energy or becomes warmer until balance is approached. Option A is correct because it gives this exact comparison. Option B describes an energy deficit, when losses exceed gains, and it usually produces cooling or loss of stored energy. Option C is wrong because an energy surplus does not mean that energy is absent; it means there is more gain than loss. Option D is wrong because surplus is not limited to sound energy; it can involve radiation, heat and other forms. In Earth’s heat budget, a region with more incoming than outgoing energy tends to warm, while a deficit tends to cool. Memory cue: surplus = income greater than expenditure.

Question 4

What is the general meaning of energy deficit?

Accepted Answer

Lost energy is greater than received energy An energy deficit occurs when a place or part of the Earth loses more energy than it receives. This reduces heat and creates a tendency for temperature to fall or for cooling. Option B represents an energy surplus, while option C represents energy balance. Exam tip: Remember that a deficit means outgoing or lost energy is greater than incoming energy.

Question 5

Why can low latitudes have an energy surplus?

Accepted Answer

Sun rays fall more directly there Equatorial areas receive more solar energy so surplus can occur. In exams link low latitudes with higher incoming energy.

Question 6

Why can high latitudes have an energy deficit?

Accepted Answer

Sun rays fall more obliquely there High latitudes receive less solar energy per area. In exams link polar areas with lower incoming energy.

Question 7

What causes latitudinal differences in heat budget?

Accepted Answer

Difference in angle of solar rays Energy distribution changes because the angle of sun rays changes. In exams link latitudinal budget with solar angle.

Question 8

Why is latitudinal transfer of heat important?

Accepted Answer

It helps reduce energy surplus and deficit Atmosphere and oceans move heat from one place to another. In exams see heat transfer as a balancing process.

Question 9

How do atmosphere and oceans help in heat balance?

Accepted Answer

They transfer heat between regions Winds and currents can carry heat from warmer to colder regions. In exams treat them as heat distributors.

Question 10

Why does temperature not rise endlessly near the equator despite energy surplus?

Accepted Answer

Heat transfer and outgoing radiation occur Extra heat is removed by atmosphere oceans and radiation. In exams link energy surplus with transfer.

Question 11

Why does temperature at poles not fall endlessly despite energy deficit?

Accepted Answer

Heat is transferred from other regions Heat moves from low latitudes toward poles through atmosphere and oceans. In exams remember global heat transfer.

Question 12

What is the importance of ocean currents in heat budget?

Accepted Answer

They transfer heat Ocean currents carry warm and cold water to different regions. In exams link currents with heat transport.

Question 13

How do winds take part in the heat budget?

Accepted Answer

They move warm and cold air Winds carry heat from one region to another. In exams consider wind a medium of heat distribution.

Question 14

What is the relation between heat budget and climate?

Accepted Answer

Heat budget explains the thermal basis of climate Energy balance is a basis for understanding temperature and climate. In exams link heat budget with climate study.

Question 15

If cloud amount increases what may happen to energy reaching the surface during day?

Accepted Answer

It may decrease More clouds can reflect or absorb a larger part of solar energy. In exams treat daytime clouds as reducing incoming energy.

Question 16

How can clouds help keep the surface relatively warm at night?

Accepted Answer

They send back some terrestrial radiation At night the ground loses energy by emitting terrestrial radiation, mainly in the form of longwave infrared radiation. Clouds contain water droplets and ice particles that absorb some of this outgoing radiation. They then emit radiation in different directions, including back toward the surface. This downward counter-radiation reduces the net loss of heat from the ground, so the surface and lower air usually cool less on a cloudy night than on a clear night.

Therefore option A is correct: clouds send back part of the terrestrial radiation. They do not produce sunlight, stop the Earth, or dry the oceans. The warming effect is relative, not an addition of solar heat; clouds generally reduce night-time radiational cooling by acting as a partial insulating layer.

Question 17

Why may a part of solar energy not reach Earths surface?

Accepted Answer

Due to reflection scattering and absorption Atmosphere and clouds can change solar energy before it reaches the surface. In exams remember these three processes together.

Question 18

Re radiation of energy in heat budget is related to what?

Accepted Answer

Radiating absorbed energy again The atmosphere can radiate absorbed longwave energy again. In exams link re radiation with greenhouse effect.

Question 19

What is the energy relation between surface and atmosphere in Earths heat budget?

Accepted Answer

Both exchange energy The surface emits energy and the atmosphere absorbs and re radiates part of it. In exams understand it as a connected system.

Question 20

Why is long term average important in heat budget?

Accepted Answer

Because daily and local changes can differ Heat budget shows global and long term energy balance. In exams keep weather and climate scale separate.

Question 21

Which statement is correct for Earths heat budget?

Accepted Answer

It shows not only incoming energy but also outgoing energy The direct answer is A: Earth’s heat budget shows both incoming and outgoing energy. A heat budget is an accounting of energy received from the Sun, energy reflected by clouds, atmosphere and surfaces, and heat later emitted by Earth as long-wave radiation. Reasoning: solar energy enters the Earth system; some is reflected; some is absorbed by the atmosphere, land and oceans; Earth releases energy back to space; comparing gains and losses explains temperature balance. Option A is correct because it includes both sides. Option B is wrong because tree numbers belong to vegetation or ecology, not the definition of heat budget. Option C is wrong because river length is a geographic measurement, not an energy account. Option D is wrong because mountain height is topography, not heat accounting. Exam cue: budget always means income and expenditure; heat budget means energy in and energy out.

Question 22

Understanding heat budget helps answer which question?

Accepted Answer

How Earth gains and loses energy Heat budget explains Earths energy gain and energy loss processes. In exams study it as Earths energy account.

Question 23

If a surface in an area reflects a lot how will heating be there?

Accepted Answer

It may be lower With more reflection the surface absorbs less energy. In exams link high albedo with lower heating.

Question 24

If a surface in an area absorbs more how will heating be there?

Accepted Answer

It may be higher More absorption stores more energy in the surface and temperature can rise. In exams link absorption with heating.

Question 25

Which is the correct matching of the roles of Sun and Earth in heat budget?

Accepted Answer

Sun gives energy and Earth radiates energy Incoming energy comes from the Sun and Earth sends out longwave energy. In exams remember directions of incoming and outgoing energy.

The heat budget of the earth

Practice questions

01 Which radiation is emitted from Earths surface both day and night?

02 Why is Earths heat budget considered balanced in the long term?

03 What is the general meaning of energy surplus?

04 What is the general meaning of energy deficit?

05 Why can low latitudes have an energy surplus?

06 Why can high latitudes have an energy deficit?

07 What causes latitudinal differences in heat budget?

08 Why is latitudinal transfer of heat important?

09 How do atmosphere and oceans help in heat balance?

10 Why does temperature not rise endlessly near the equator despite energy surplus?

11 Why does temperature at poles not fall endlessly despite energy deficit?

12 What is the importance of ocean currents in heat budget?

13 How do winds take part in the heat budget?

14 What is the relation between heat budget and climate?

15 If cloud amount increases what may happen to energy reaching the surface during day?

16 How can clouds help keep the surface relatively warm at night?

17 Why may a part of solar energy not reach Earths surface?

18 Re radiation of energy in heat budget is related to what?

19 What is the energy relation between surface and atmosphere in Earths heat budget?

20 Why is long term average important in heat budget?

21 Which statement is correct for Earths heat budget?

22 Understanding heat budget helps answer which question?

23 If a surface in an area reflects a lot how will heating be there?

24 If a surface in an area absorbs more how will heating be there?

25 Which is the correct matching of the roles of Sun and Earth in heat budget?

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