Evaporation
What is the main source of energy that causes evaporation?
Which living things are mainly responsible for transpiration?
Plants
What happens when water vapour cools?
It changes into tiny water droplets.
What is water falling from clouds called?
Precipitation
Name one place where water can collect.
An ocean, lake, river, or pond.
What does liquid water change into during evaporation?
Water Vapour (a gas)
What do plants release during transpiration?
Water vapour.
What is the opposite of evaporation?
Condensation
Name two types of precipitation.
Rain and snow. (Hail and sleet are also correct.)
Where is most of Earth's water found?
In the oceans.
What is evaporation?
The process where liquid water changes into water vapour and enters the atmosphere.
What is transpiration?
The process where plants release water vapour into the atmosphere through tiny openings in their leaves.
What is condensation?
The process where water vapour cools and changes into liquid water droplets.
What causes precipitation to fall from clouds?
Water droplets or ice particles become heavy enough for gravity to pull them towards Earth.
What is collection in the water cycle?
When water gathers in places such as oceans, lakes, rivers, soil, glaciers, and underground.
Why does a puddle disappear faster on a hot, sunny day than on a cold day?
The heat gives the water more energy, causing it to evaporate faster.
How does water get from the soil into a plant before transpiration happens?
The plant's roots absorb water from the soil, and it moves through the plant to the leaves.
Why can you sometimes see water droplets on the outside of a cold glass?
Water vapour in the air cools when it touches the cold glass and condenses into liquid droplets.
How can the temperature of the atmosphere affect whether precipitation falls as rain or snow?
If the air is warm enough, precipitation falls as rain. If it stays below freezing, it can fall as snow.
How can rainwater from a field eventually reach the ocean?
It can flow over the land into streams and rivers, which eventually carry it to the ocean.
A wet T-shirt is left outside on a windy day. Explain why it dries faster than it would inside on a still day.
Heat and wind increase evaporation. Wind moves water vapour away from the shirt, allowing more water to evaporate.
A plant has plenty of water in its roots, but its leaves are releasing water vapour. Explain how this is connected to the water cycle.
Water is absorbed from the soil by the roots, transported through the plant to the leaves, and then released into the atmosphere as water vapour through transpiration. This returns water to the atmosphere and continues the water cycle.
Explain how water vapour high in the atmosphere can eventually become part of a cloud.
Water vapour rises into the atmosphere, cools, and condenses around tiny particles in the air, forming small water droplets or ice crystals that make up clouds.
A cloud contains tiny water droplets, but no rain is falling. What needs to happen for rain to begin?
The droplets need to combine and grow larger and heavier until gravity pulls them down as precipitation.
After heavy rain, some water flows over the ground while some soaks into the soil. Explain what can happen to both types of water.
Surface water can flow into streams and rivers, while water that soaks into the ground can become groundwater and eventually move into rivers, lakes, or oceans.