Science Grade 6 Concept 3.2 Heat and Weather Changes Lesson 3 Exercises 2026 كتاب المعاصر скачать в хорошем качестве

Science Grade 6 Concept 3.2 Heat and Weather Changes Lesson 3 Exercises 2026 كتاب المعاصر

Exercises on Lesson 3 1. Choose the correct answer 1. The cold air is .. and always (Qalyoubia 2024) a. less dense moves down c. more dense - moves up b. less dense - moves up d. more dense moves down. 2. Convection currents occur in the atmosphere when,.. (Cairo 2024) a. cold air rises up and warm air falls down b. warm air rises up and cold air falls down c. both cold air and warm air rise up d. both cold air and warm air fall down 3. Convection currents in the atmosphere are controlled by a. precipitation process b. moon's rotation c. the thermal energy from the Sun d. the light energy from the moon 4. Heat is transferred through the atmosphere by.. a. convection b. conduction c. reflection d. absorption 5. The tool that is used to measure the speed of precipitation is a. anemometer b. barometer c. thermometer d. weather radar 2. Choose from column (B) what suits it in column (A): (A) Devices 1. Anemometer 2. Weather radar 3. Rain gauge (B) Uses a. measuring the atmospheric pressure. b. measuring the speed of wind. c. measuring the intensity and speed of precipitation. d. measuring the amount of rain. 3 Put (v) or (x) 1. When air is cooled its molecules spread away from each others 2. Cold air has more density than that of hot air. 3. By increasing the temperature of air, its density decreases. 4. Convection currents in the atmosphere are usually controlled by Earth's rotation. 5. Convection currents are related to the horizontal movement of air. 6. When air is heated its density doesn't change. 7. When air is cooled, it rises up. 8. Hot air rises above colder air. (Cairo 2024) 9. The lighted bulb releases heat which rises the temperature of air around the bulb. 10. The direction of wind movement is affected by the difference of air temperature 11. Anemometer is used to measure the speed of precipitation 12. Rain guage and weather radar have the same function 13. Transfer of heat by convection occurs in solids, liquids and gases 14. The hand that is placed above a lighted candle feels hot because hot air has high density so it moves up 4. Write the scientific term of each of the following: 1. The falling of snow to the Earth's surface, when water droplets in clouds are changed into ice crystals 2. The vertical movement of air in the atmosphere 3. The horizontal movement of air in the atmosphere 4. The tool that is used to measure the intensity and speed of precipitation 5. The tool that is used to measure the amount of rain in a certain area 6. The force that pulls big and heavy water droplets toward the ground causing precipitation (Cairo 2025) 5 Complete the following sentences: 1. Hot air rises up as .. it has lower .. than that of cold air 2. The density of hot soup is .. than that of cold soup 3. Gases and liquids expand by and contract by cooling 4. When air is heated, it expands as its ......move away from each other 5. When air is it will rise above the cold air (Giza 2024) 6. The horizontal movement of air is called .., whereas the vertical movement of air is called .. 6 Give reasons for: 1. When air is heated, it expands 2. Convection currents in the atmosphere are considered as vertical movements of air 3. The bigger and heavier water droplets are falling down to the Earth's surface causing precipitation 7 What happens to ..? 1. The water movements when boiling it in a pot (Giza 2024) 2. The water droplets in clouds when they become bigger and heavier 3. The water droplets in clouds when the air is cold enough (Beheira 2025) 8 What is the use of ..? 1. Anemometer: (Cairo 2025) 2. Weather radar: 3. Rain gauge: Look at this picture, then complete the following sentences by using the words between brackets (hot-vertical-cold-increases - horizontal decreases) 1. When the air is heated inside the balloon, the air ... in volume 2. As the temperature increases, the density of air inside the balloon 3. A balloon rises up because the air inside the balloon is lighter than the air surrounding the balloon 4. The rising of the balloon up depends on the movement of air .. 5. The right and left movement of the balloon depends on the movement of air .. #المعاصر #grade6 #elmoasser #grade6science #learning #حل_كتاب_المعاصر #شرح_المعاصر #egypt #learning #concept3 #lesson3 #exercise #ibrahim_soltan #ابراهيم_سلطان #heat #weather #education