Water is used to grow crops, and irrigation helps to farm in dry climates.
How is water important to agriculture?
100
Earth is more than 97% salt water.
What percentage of Earth's water is salt water?
100
A water molecule is made of two hydrogen atoms and one oxygen atom.
What elements is water made of?
100
Capillary action allows water to defy gravity.
What does capillary action allow water to do?
100
When water vapor in the air cools, these are formed.
How do clouds form?
200
Water is used to cool machinery, and to power mills.
How is water crucial to the industry?
200
Of all Earth's freshwater, 0.35% is in lakes and rivers.
Of all freshwater on Earth, what percentage is in lakes and rivers?
200
Water molecules attract molecules that are also polar, and when a molecule isn't also polar it won't dissolve as well.
How does a polar molecule affect how a solvent dissolved in a solute?
200
Ice floats in water because instead of all of the molecules packing together, the molecules form an arranged patter. The arranged pattern that the molecules form, is less dense than water in it's liquid state.
Why does ice float in water?
200
The water cycle is the cycle of water from living to non living things.
What is the water cycle?
300
Rivers, oceans, and waterways can transport people and goods. They have been natural highways for decades.
How is water used for transportation?
300
Of all the water on Earth, 3% is fresh water.
What percentage of water on the earth is fresh water?
300
The positive hydrogen atom is attracted to another negative oxygen atom.
How do water molecules arrange next to one another?
300
Specific heat is the amount it takes water to heat up or cool down at 1 degree Celsius. Waters specific heat is higher, and thus it takes more energy for water to change it's temperature.
Why does water heat up and cool down slower than many things?
300
In the water cycle water cycles through bodies of water, land. the atmosphere, and living things.
What are the stages of the water cycle?
400
Water is used for many activities, such as swimming, skiing, fishing, and skating.
How is water used for recreational activities?
400
About 23% of all Earth's fresh water is ground water.
Out of all the fresh water on Earth, what percentage is ground water?
400
Hydrogen is attracted to oxygen because hydrogen is positive, and oxygen is negative.
Why do hydrogen molecules attract to oxygen molecules?
400
If ice was to sink in liquid water, than all of the aquatic animals that live on the bottom of the ocean would die. Also the UV rays that are reflected off of glaciers would no longer be reflected. This would cause Earth's temperatures to rise.
Why is it important that ice floats?
400
Water is evaporated from plants through transpiration. It is takes place over the ocean and bodies of water.
What are two ways that evaporation occurs?
500
Water is a home for many organisms. Also without photosynthesis, all plants would die. Without water, all humans would die because of dehydration and a lack of food.
Why is water crucial for us and other life?
500
Out of all the fresh water on Earth, 76% is ice.
What percent of fresh water on Earth is ice?
500
The polar molecules of hydrogen and oxygen are pulling on one another.
Why does surface tension occur?
500
This property is condensation.
An example of this property is that when your drinking a glass of water, and the outside of the glass becomes moist and cool.