1.
Where does the energy that powers the water cycle come from?
Correct Answer
C. Sun
Explanation
The energy that powers the water cycle comes from the Sun. The Sun's heat causes water on the Earth's surface to evaporate and rise into the atmosphere. This water vapor then condenses to form clouds and eventually falls back to the Earth as precipitation, such as rain or snow. This continuous cycle of evaporation, condensation, and precipitation is driven by the Sun's energy.
2.
What is evaporation?
Correct Answer
C. Water gets warm and changes from liquid water to water vapor.
Explanation
Evaporation is the process in which water molecules gain enough energy to break free from the liquid phase and become water vapor. This occurs when the water gets warm, as the increase in temperature provides the necessary energy for the molecules to escape the liquid surface and enter the gas phase.
3.
What is the correct term for moisture that falls to the ground from clouds?
Correct Answer
B. Precipitation
Explanation
Precipitation is the correct term for moisture that falls to the ground from clouds. It includes various forms such as rain, snow, sleet, or hail. Condensation refers to the process of water vapor turning into liquid, evaporation is the process of liquid turning into water vapor, and infiltration refers to the process of water seeping into the ground.
4.
From where does most water evaporate?
Correct Answer
D. Oceans
Explanation
Most water evaporates from the oceans. This is because the oceans cover about 71% of the Earth's surface and have a large amount of water. The sun's heat causes the water in the oceans to evaporate, turning it into water vapor. This water vapor then rises into the atmosphere and forms clouds. Eventually, the water vapor condenses and falls back to the Earth as precipitation, which can be in the form of rain, snow, or hail.
5.
What is the correct term for rising water vapor meeting colder air and turning back into water droplets?
Correct Answer
A. Condensation
Explanation
Condensation is the correct term for rising water vapor meeting colder air and turning back into water droplets. When warm air containing water vapor comes into contact with colder air, the water vapor cools down and condenses into tiny water droplets, forming clouds or fog. This process is essential for the water cycle and plays a crucial role in the formation of precipitation. Evaporation refers to the process of water turning into vapor, precipitation is the collective term for any form of water that falls from the atmosphere, and infiltration refers to the process of water seeping into the ground.
6.
What are the three stages of the water cycle?
Correct Answer
C. Evaporation, condensation, precipitation
Explanation
The correct answer is evaporation, condensation, precipitation. The water cycle consists of these three stages. Evaporation occurs when water changes from a liquid state to a gaseous state and rises into the atmosphere. Condensation happens when the water vapor cools down and turns back into liquid water, forming clouds. Finally, precipitation occurs when the condensed water droplets in the clouds become heavy enough to fall back to the Earth's surface as rain, snow, sleet, or hail.
7.
What is the correct term for plants releasing water from their leaves, which then evaporates?
Correct Answer
C. Transpiration
Explanation
Transpiration is the correct term for plants releasing water from their leaves, which then evaporates. During transpiration, water is drawn up from the roots to the leaves through the xylem vessels, and then it is released into the atmosphere through small openings called stomata. This process helps in the transportation of water and nutrients throughout the plant and also helps to cool the plant. Transpiration plays a crucial role in the water cycle as it contributes to the overall movement of water from the land to the atmosphere.
8.
Where does some water from the water cycle collect underground?
Correct Answer
B. Aquifers
Explanation
Some water from the water cycle collects underground in aquifers. Aquifers are underground layers of permeable rock or sediment that hold water. They act as natural underground reservoirs and can store large amounts of water. This stored water can then be accessed through wells or natural springs.
9.
Where is water vapor found?
Correct Answer
D. All of the above
Explanation
Water vapor is found in the air around us because it is the gaseous form of water that exists in the Earth's atmosphere. It is also present in our breath, as we exhale water vapor along with other gases. Additionally, water vapor is produced when water is heated, such as in the steam that rises from a kettle. Therefore, all of the given options are correct as they represent different sources or locations where water vapor can be found.
10.
Clouds are formed by
Correct Answer
B. Water vapour condensing
Explanation
Clouds are formed by the process of water vapor condensing. When warm air rises, it expands and cools down. As the air cools, it can no longer hold as much water vapor, causing the water vapor to condense into tiny water droplets or ice crystals. These condensed water droplets or ice crystals then form clouds in the atmosphere. Therefore, the correct answer is water vapor condensing.
11.
Water droplets that are too heavy to float make:
Correct Answer
D. Rain
Explanation
Water droplets that are too heavy to float in the air form rain. When water vapor in the atmosphere condenses and forms droplets, they continue to grow in size until they become too heavy to be supported by the air currents. These droplets then fall to the ground as rain. Fog consists of tiny water droplets suspended in the air, clouds are a collection of water droplets or ice crystals, and dew forms when water vapor condenses on surfaces such as grass or leaves. However, only rain is formed by water droplets that are too heavy to float.
12.
The water cycle is the Earth's way of _______.
Correct Answer
A. Recycling water
Explanation
The water cycle is the Earth's way of continuously reusing and re-circulating water. It involves processes such as evaporation, condensation, and precipitation, which allow water to move between the atmosphere, land, and oceans. This cycle ensures that water is constantly recycled, providing a sustainable supply of fresh water for various ecosystems and human activities.
13.
As time goes by, and water goes through the water cycle, again and again, the amount of water on Earth _______.
Correct Answer
C. Stays the same
Explanation
As time goes by and water goes through the water cycle, the amount of water on Earth stays the same. This is because the water cycle is a continuous process where water evaporates from the Earth's surface, forms clouds, and then falls back to the Earth as precipitation. This cycle ensures that the total amount of water on Earth remains relatively constant over time.
14.
What is the movement of water down through the earth's surface?
Correct Answer
B. Infiltration
Explanation
Infiltration refers to the movement of water down through the earth's surface. It occurs when water seeps into the soil and is absorbed by it. This process is important for replenishing groundwater and maintaining soil moisture levels. Irrigation, on the other hand, refers to the artificial application of water to land for agricultural purposes. Irradiation is the process of exposing something to radiation. Run-off refers to the movement of water over the earth's surface, typically after rainfall, and it can lead to erosion and the formation of streams and rivers.
15.
Which of the following is not an example of precipitation?
Correct Answer
A. Vapour
Explanation
Vapour is not an example of precipitation because precipitation refers to the process of water falling from the atmosphere to the Earth's surface. Vapour, on the other hand, is the gaseous form of water that is present in the atmosphere. It is not in a condensed form and does not fall as rain, snow, or hail.