Depletion of water table - class-VII

All of the following are true. Increasing population creates demand for construction of houses, shops, offices, roads and pavements. This decreases the open areas like parks, and playgrounds. This, in turn, decreases the seepage of rainwater into the ground.

Water used by most of the industries is drawn from the ground.

Water table may go down if the water is not sufficiently replenished. This may happen due to the following reasons. Increasing population, Increasing industries, agricultural activities.

Water table may go down if the water is not sufficiently replenished. This may happen due to scanty rainfall, deforestation  and  decrease in the effective area for seepage of water.

Increasing population creates demand for construction of houses this, in turn, decreases the seepage of rainwater into the ground. 

A majority of farmers in India depend upon rains for irrigating their crops.

Water consumption of a city depends on the size of the city which is directly related to the population of the city and demand of water in the city. When population increases consumption of water in daily needs, like drinking, bathing cooking also increases. Similerly construction work increase which consume excess amount of water.

Depletion of underground water mainly cause by multiple factors like over population which increase water demand day by day. People move from rural area to urban for better lifestyle due this number of building are constructing. Concrete is main material used in building construction which take lot of water.

• Limestone is a sedimentary rock composed primarily of calcium carbonate($CaCo _3$) in the form of the mineral calcite.
  
• Limestone tiles are made of natural stone, and it's one of the most affordable options if you want to avoid artificial materials for your flooring.
• Limestone floor does not allow rainwater to seep into the ground because it is low porosity.
• So, the correct answer is 'Limestone floor'.

70% of the earth's surface is covered with water, yet only around 3%  is fit for human consumption.The remaining is frozen or salty.The consumption of water goes on increasing due to population,eventually leading to scarcity of water. The industrial wastes pollute the water reservoirs, making it unfit for human consumption.

The water present underground within cracks in between the rocks, soil or sand known as groundwater. This groundwater is replenished by the rain water that seeps into the soil through the cracks. It forms around twenty percent of the world's fresh water supply and is the major source of water in rural areas. Thus the correct answer is option B.

The main cause of water depletion is due to over pumping of ground water

The following can be the solution for water scarcity caused by agriculture are:
a) knowledge and resources for producing more and better crops with less water.
b) drip water irrigation.
c) more efficient water management systems adapted to climate variability.

Mostly water is used in agriculture purpose.

Drip irrigation technology was developed and commercialized by Israeli engineers (notably Simcha Blass and his company) in the 1960s-1970s. The 1970s saw widespread commercial adoption of this water-efficient irrigation method, making option A correct. Later decades saw improvements but the initial commercialization was earlier.

Use of water in agriculture is the main cause of water scarcity because a large amount of appropriate quality and quantity of water is essential for the production of crops which makes agriculture is the largest user of water.

• Groundwater is the water found underground in the cracks and spaces in soil, sand, and rock.
• Groundwater is useful in many ways such as irrigation, drinking, washing, etc.
• Increasing population is responsible for groundwater shortage.
  
• So, the correct answer is 'Increase in population'.

While population growth and dams contribute to water stress, droughts are direct, acute events that cause immediate and severe water crises by depleting available supplies.