Science Grade 6 Energy Transfer Through the Water Cycle 3.1 Lesson 2 2026

Описание: LESSON TWO
How Do Solar Energy and Gravity Drive the Processes of the Water Cycle?
Put v or x
1Condensation and evaporation are two opposite processes
2.The amount of solar energy that reaches the Earth differs from one place to another on Earth's surface
-In this activity, we will study what is meant by the water cycle and the factors affecting it
Water cycle It is the continuous movement of water among different water reservoirs. They are storage locations of water on Earth
Water reservoirs include
Oceans- Rivers-Rocks-Seas-Glaciers-Living organisms-Lakes- Soil- Atmosphere
The main processes and steps that move water among these reservoirs are evaporation, condensation, precipitation, runoff and collection
All these processes and steps depend on energy and force
The factors that affect the movement of water in the water cycle
Solar energy
The Sun is the most important source of energy that affects the water cycle
The sunlight (solar radiation) that comes from the Sun includes thermal energy that causes the change of the state of water through the water cycle
During melting, when water changes from solid state (ice) to liquid state (liquid water), it gains energy
During evaporation, when water changes from liquid state (liquid water) to gas state (water vapor), it gains energy
During condensation, when water changes from gas state (water vapor) to liquid state (liquid water), it loses energy
During freezing, when water changes from liquid state (liquid water) to solid state (ice), it loses energy
Gravity force
Water starts to move or change its way of movement when a force affects it
Wind energy is another type of force that affects the movement of water
There is a main force that affects the water cycle, which is gravity force
Water can be pulled downward by gravity force, where it causes:
1Falling of melting ice crystals and water droplets found in clouds back to Earth's surface
leads to The flowing of liquid water downhill into streams and rivers towards larger water bodies
2Flowing of water in solid state (ice) in glaciers from higher elevation areas to lower elevations areas. leads to
The frozen water melts and flows into the ground or the water bodies.
3Flowing of liquid water from 3 higher elevation areas to lower elevation areas. leads to Leakage of liquid water down into the ground then to groundwater reservoirs
Complete the following sentences
(gravity-condenses-thermal energy)
1Water vapor releases (loses) energy when it
2Water can be pulled downward by force
3Factors that move the water cycle are gravity force. that comes from the Sun
Activity5 Energy and Water
Energy and the water cycle
From the previous activities, you have known that when water changes from one state to another, it gains (absorbs) or losses (releases) energy.
Gaining or losing energy affects the water particles (molecules) in the air
The movement of air from one place to another in the presence of difference in temperature leads to
Changing of liquid water to water vapor and this process is known as "evaporation"
Changing of water vapor to liquid water (in the form of water droplets) and this process is known as "condensation"
Transfer of energy
Condensation and freezing are two processes occur when water particles lose thermal energy
Melting, evaporation and transpiration (in plant leaves) are processes occur when water particles gain thermal energy
Evaporation
Through the water cycle, the Sun heats water in oceans, seas, lakes, rivers, streams and other water bodies
This leads to evaporation of water and changing it into water vapor due to gaining thermal energy
Transpiration: It is a type of evaporation that takes place through the stomata on the plant's leaves
About 10% of water vapor in the air comes from transpiration of plants
From the previous example you can conclude that:
The amount of energy from the Sun affects the rate of transpiration in leaves
When the amount of the energy comes from the Sun increases.
The transpiration in plant's leaves increases
Condensation occurs when: The air that is saturated with water vapor cools due to decreasing of air temperature, so the water vapor changes into liquid water
Clouds are formed, where they consist of tiny water droplets that are condensed in the air, so water vapor releases its energy and changes into liquid water
Clouds are formed due to condensation of water vapor into water droplets that attach to particles of dust, smoke,. etc. in the air
When very large numbers of these water droplets join together, they form clouds
Clouds are made up of millions of tiny water droplets, when these water droplets become too heavy, they fall in the form of rain.
The following sentences describe evaporation and condensation processes, classify each of them
Warm air rises up and moves over cooler mountain
Energy from the Sun heats the top layer of water in the sea
A puddle in the hot desert decreases in size until it disappears
#lesson2
#grade6
#المعاصر
#حل_كتاب_المعاصر
#egypt