What is a water table Class 7?
The upper level of an underground surface in which the soil or rocks are permanently saturated with water is called the water table.
What is water table short answer?
water table, also called groundwater table, upper level of an underground surface in which the soil or rocks are permanently saturated with water. The water table separates the groundwater zone that lies below it from the capillary fringe, or zone of aeration, that lies above it.
Which could be the location where water emerges from the surface as a spring?
A spring is a natural discharge point of subterranean water at the surface of the ground or directly into the bed of a stream, lake, or sea. Water that emerges at the surface without a perceptible current is called a seep. Wells are holes excavated to bring water and other underground fluids to the surface.
Where is groundwater located the zone of what?
Groundwater is found in two zones. The unsaturated zone, immediately below the land surface, contains water and air in the open spaces, or pores. The saturated zone, a zone in which all the pores and rock fractures are filled with water, underlies the unsaturated zone.
How does deforestation lead to depletion of water table?
Vegetation slows down the flow of rainwater on land and increases the absorption of water by the soil. Cutting down of trees and destroying vegetation, therefore interferes with the natural process by which seeping takes place and the groundwater is recharged. It finally results in the depletion of the water table.
What is precipitation Ncert solutions?
Answer: The sun's heat vaporises water into vapour. This vapour cools down and condenses to become clouds. This may then fall on the surface of Earth in the form of rain, snow or sleet. This phenomenon of water falling back onto the surface of the earth in the form of rain, snow or sleet is called precipitation.
How is spring created?
Springs occur when water pressure causes a natural flow of groundwater onto the earth's surface. As rainwater enters or "recharges" the aquifer, pressure is placed on the water already present.
How are natural springs of water formed?
A spring is a water resource formed when the side of a hill, a valley bottom or other excavation intersects a flowing body of groundwater at or below the local water table, below which the subsurface material is saturated with water.
How do springs form?
A spring is formed when the water reaches the surface through a fracture or porous layer. These types of springs usually occur along faults (a fracture in the earth), or in areas of great topographic relief such as cliffs or valleys.
How are natural spring of water formed?
A spring is a water resource formed when the side of a hill, a valley bottom or other excavation intersects a flowing body of groundwater at or below the local water table, below which the subsurface material is saturated with water.
How is groundwater formed?
Most groundwater comes from precipitation. Precipitation infiltrates below the ground surface into the soil zone. When the soil zone becomes saturated, water percolates downward. A zone of saturation occurs where all the interstices are filled with water.
What do you mean by planned harvesting of forest How does it help in their conservation?
Planned harvesting of forest is a method employed by the government to conserve forests. Under this, all the trees of a forest are prevented from getting cut while converting it into an agricultural land. Cutting of all the trees may lead to soil erosion and other natural problems.
What are the main causes of depletion of water resources mention the various method of conservation of water resources?
The two main causes of Depletion of Water Table are Deforestation and Over-pumping of groundwater.
How are spring tides formed Class 7?
During the full moon and new moon days, the sun, the moon and the earth are in same line and the tides are highest. These tides are called spring tides. When the moon is in its first and last quarter, the ocean water get drawn in diagonally opposite directions by gravitational pull of sun and earth resulting low tides.
What is evaporation condensation and precipitation Class 7?
Evaporation is the first stage in which water from the earth's surface (mainly the water bodies) changes into water vapour because of the heat from the sun. Condensation is the process by which the accumulated water vapour in the atmosphere cools down in lower temperatures. Precipitation is explained below.
How do natural springs occur?
Springs occur when water pressure causes a natural flow of groundwater onto the earth's surface. As rainwater enters or "recharges" the aquifer, pressure is placed on the water already present.
Why does spring happen?
In the hemisphere that is tilted closer to the sun, temperatures become warmer. Warmer temperatures means the ground, which may have frozen over the winter months, grows softer and more yielding to plants. Spring is often marked by increased rainfall, which helps to water the infant seeds taking root in the ground.
What are springs made of?
Springs are generally made of hardened steel. The spring manufacturer has the option of using either pre-hardened steel before forming the spring, or they can also harden the spring after the formation process.
How do you make a spring?
A spring is formed when natural pressure forces groundwater above the land surface. This can occur at a distinct point or over a large seepage area. Springs are sometimes used as water supplies and can be a reliable and relatively inexpensive source of drinking water if they are developed and maintained properly.
How are springs formed for kids?
Springs develop when rainfall sinks through the soil to the rocks beneath. Some kinds of rock, such as sandstone, are porous, or full of little holes like sponges. These rocks will behave like sponges and absorb the water.
How hot springs are formed?
How is Hot Spring Formed? When the rainwater or the groundwater heats upon coming in contact with the rocks that have been heated by magma, deep beneath the Earth's surface, Hot Spring is formed. This form of geothermal spring generally occurs in areas near volcanic activities.
How do aquifers form?
Similar to a below-ground sponge, aquifers are the natural accumulation of runoff and precipitation. Below the surface, this runoff then percolates into crevices between rocks, silt and other material.
Where is groundwater found quizlet?
Where can GROUNDWATER be found? It is found underground in the pore spaces between grains in sediments and rocks or in fractures and cavities in rocks.
How are wildlife conservation forest conservation and soil conservation related?
Wildlife conservation, forest conservation and soil conservation — all three are inter- related. It is because, by conserving the forest, wildlife and soil are automatically conserved. When we conserve forests, we conserve soil by preventing soil erosion. They also maintain the fertility of soil.
How exploitation of forest resources by industrialists affects nature?
These negative impacts include: destruction of forest cover, loss of biodiversity, ecological imbalance, soil compaction, soil erosion, flooding, desert encroachment and disruption of hydrological cycle.
What do you understand by impact of climatic change its impact on ground water quantity and its quality?
Climate change does not only affects groundwater quantity, but also its quality. Sea level rise may lead to salt water intrusion into coastal aquifers affecting groundwater quality and contaminating drinking water sources. Once salt water has intruded into fresh water system it is difficult to reverse the process.
How has deforestation resulted in a decline in the water table?
Vegetation slows down the flow of rainwater on land and increases the absorption of water by the soil. Cutting down of trees and destroying vegetation, therefore interferes with the natural process by which seeping takes place and the groundwater is recharged. It finally results in the depletion of the water table.
How is a spring tide formed?
The highest tides, called spring tides, are formed when the earth, sun and moon are lined up in a row. This happens every two weeks during a new moon or full moon. Smaller tides, called neap tides, are formed when the earth, sun and moon form a right angle.
What are spring tides?
When the gravitational effects of the Sun and the Moon combine, we get spring tides, which have nothing to do with the season of spring. The term refers to the action of the seas springing out and then springing back. These are times of high high tides and low low tides.
What is hydrologic cycle in science?
The hydrologic cycle describes the pilgrimage of water as water molecules make their way from the Earth's surface to the atmosphere, and back again. This gigantic system, powered by energy from the sun, is a continuous exchange of moisture between the oceans, the atmosphere, and the land.