Droughts are caused by changes in land and sea surface temperatures, atmospheric circulation patterns and soil moisture content. A change in any one of these factors sets up a cyclical chain of events that can result in extreme climate conditions such as drought.Know More
Unusual warming or cooling of sea surface temperatures can create a change in air temperature. This change of air temperature can affect the location of convection currents responsible for weather patterns, shifting warmer air over previously cooler locations. Heated air pulls moisture from the soil, allowing it to form clouds and return to the Earth as rain when it enters the cooler upper atmosphere. If weather patterns shift enough to create an area with little rainfall over a period of time, there is not enough moisture in the soil to draw up into the air to create clouds once the weather pattern shifts back to its former location. Moisture continues to be removed from the soil on a daily basis, and no rain clouds are able to form to replace the moisture.
Sustained dry periods can create droughts that cause economic distress across an area. Drought can impact crops, the water supply, stream water quality, recreation, hydropower generation, navigation and forest resources.Learn more about Rain
Put simply, droughts are caused by a prolonged depletion of precipitation in a certain ecosystem or climate over a long period of time. Unlike normal dry spells, droughts are so severe that they can thoroughly dry out vast expanses of land, like deserts. Droughts can be extraordinarily damaging and expensive to the people who live in the environments where they occur, especially in terms of the agricultural industry.Full Answer >
Overgrazing is caused by having too many animals grazing on land or by not properly controlling the grazing activity of the animals. Overgrazing results in several negative consequences to both the land and the animals.Full Answer >
Any time the droplets in clouds grow and come together to form drops that are large enough to create a speed of falling that is greater than the speed at which the cloud is blowing upward, then they head downward, and if they make it down without evaporating, people on the ground experience them as rain or snow. Sometimes rain evaporates again and heads back up into the clouds. The greater the amount of water vapor under the cloud and the stronger the winds on the updraft, the more likely precipitation becomes.Full Answer >
Fog forms when water droplets condense to form fog close to the ground. The water droplets are formed when water vapor bonds with condensation nuclei. Water evaporation can occur from bodies of water, wind, precipitation and atmospheric heating.Full Answer >