Nature has three different states of substances: solid, liquid and gas. Water Cycle
When we refer to water, in its liquid state , we can find it in seas, oceans and rivers; in its solid state, it can be found as ice cubes, just as in its gaseous state it is found in clouds. In this way, depending on the conditions it undergoes, water can be found in one state or another. As is already known, ice, due to the effect of heat, converts into liquid water which, in turn, can evaporate and change into a gaseous state. This means that water can change, but it retains its identity as it is still H20.
The water cycle is understood as the path followed by water on Earth. In other words, energy from the sun produces evaporation in such a way that water from the sea and rivers evaporates through condensation. When steam reaches the upper layers of the atmosphere it cools and condenses forming clouds. Due to the action of the wind, clouds are dragged and cause rain or snow. In this way the water returns to Earth and feeds the plants, this process is called precipitation. The water that runs through the Earth creates rivers and forms underground water, this process is known as infiltration.
This exchange of water that takes place between the Earth, the sea and the air forms the water cycle. This mechanism of nature has the four stages mentioned: evaporation, condensation, precipitation and infiltration.
Water, an essential substance to understand life
Water moves permanently. Percentage, most of the water is found in the oceans (approximately 70% of the Earth’s surface is covered by salt water). In relation to fresh water, it is stored in glacial regions of the north and south poles (so that the ice melts flows into the ocean ).
Fresh water is found in lakes, streams and on the Earth itself, while the rest of the water supply is concentrated in clouds. The amount of water in the atmosphere is very small compared to what exists on the Earth’s surface.
The continuous water cycle is accompanied by certain dangers caused by human action, acid rain being the main one. Some industries and certain fuels produce contaminants (for example, nitrogen oxide) that end up mixing with atmospheric water and forming acid rain. Its harmful effects on soil, vegetation or health are well known. There are also other hazards that can affect the water cycle, such as radioactive substances or inorganic chemicals (eg cadmium and mercury ).