Air and water are two essential things on earth without which life would not possible:
Air
Air is the natural mixture of gases that surround the earth. It is made of 79% nitrogen, 20% oxygen, and 1% other gases, mostly carbon dioxide, and a bunch of others gases. The composition of air changes depending on the place. For example, at very high altitudes, there is a lot of ozone, that reduces the amount of ultraviolet light that comes from the sun and gives us cancer and sunburns.
Air is used to burn things, for example, a log. The oxygen in the air reacts with the stuff in the log to make a bunch of new stuff.
The air we breathe in is used to burn the stuff we eat to make energy. The oxygen in the air drives our life. Plants use the carbon dioxide in the air to make sugars which they will later burn for energy.
Air also suspends clouds, which are water and turn into rain. This means that water moves in the form of a cycle. If water just sat around, a lot of things could only grow in a river. Air also suspends objects that float on air.
In conclusion, air keeps things alive and powers the planet (and wastes your gas money, and kills people).Know more about this click here Water Contamination and Water Contamination Facts
Water
Water is a chemical substance with the chemical formula H2O. Its molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state, water vapor or steam.
Water covers 71% of the Earth's surface, and is vital for all known forms of life. On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in aquifers and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation. Oceans hold 97% of surface water, glaciers and polar ice caps 2.4%, and other land surface water such as rivers, lakes and ponds 0.6%. A very small amount of the Earth's water is contained within biological bodies and manufactured products.
Water moves continually through a cycle of evaporation or transpiration (evapo transpiration), precipitation, and runoff, usually reaching the sea. Over land, evaporation and transpiration contribute to the precipitation over land.
Clean drinking water is essential to human and other life forms. Access to safe drinking water has improved steadily and substantially over the last decades in almost every part of the world.
The groundwater and fresh water are useful or potentially useful to humans as water resources.
Water is fundamental to photosynthesis and respiration. Photosynthetic cells use the sun's energy to split off water's hydrogen from oxygen. Hydrogen is combined with CO2 (absorbed from air or water) to form glucose and release oxygen. All living cells use such fuels and oxidize the hydrogen and carbon to capture the sun's energy and reform water and CO2 in the process (cellular respiration).
Both air and water exerts pressure in all directions.
Air
Air is the natural mixture of gases that surround the earth. It is made of 79% nitrogen, 20% oxygen, and 1% other gases, mostly carbon dioxide, and a bunch of others gases. The composition of air changes depending on the place. For example, at very high altitudes, there is a lot of ozone, that reduces the amount of ultraviolet light that comes from the sun and gives us cancer and sunburns.
Air is used to burn things, for example, a log. The oxygen in the air reacts with the stuff in the log to make a bunch of new stuff.
The air we breathe in is used to burn the stuff we eat to make energy. The oxygen in the air drives our life. Plants use the carbon dioxide in the air to make sugars which they will later burn for energy.
Air also suspends clouds, which are water and turn into rain. This means that water moves in the form of a cycle. If water just sat around, a lot of things could only grow in a river. Air also suspends objects that float on air.
In conclusion, air keeps things alive and powers the planet (and wastes your gas money, and kills people).Know more about this click here Water Contamination and Water Contamination Facts
Water
Water is a chemical substance with the chemical formula H2O. Its molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state, water vapor or steam.
Water covers 71% of the Earth's surface, and is vital for all known forms of life. On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in aquifers and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation. Oceans hold 97% of surface water, glaciers and polar ice caps 2.4%, and other land surface water such as rivers, lakes and ponds 0.6%. A very small amount of the Earth's water is contained within biological bodies and manufactured products.
Water moves continually through a cycle of evaporation or transpiration (evapo transpiration), precipitation, and runoff, usually reaching the sea. Over land, evaporation and transpiration contribute to the precipitation over land.
Clean drinking water is essential to human and other life forms. Access to safe drinking water has improved steadily and substantially over the last decades in almost every part of the world.
The groundwater and fresh water are useful or potentially useful to humans as water resources.
Water is fundamental to photosynthesis and respiration. Photosynthetic cells use the sun's energy to split off water's hydrogen from oxygen. Hydrogen is combined with CO2 (absorbed from air or water) to form glucose and release oxygen. All living cells use such fuels and oxidize the hydrogen and carbon to capture the sun's energy and reform water and CO2 in the process (cellular respiration).
Both air and water exerts pressure in all directions.
