Question

Which is not a source of freshwater?
(1) Glaciers and ice sheets
(2) Groundwater
(3) Surface runoff
(4) Oceans

Answer 1

Hint: Any naturally occurring water with low quantities of dissolved salts and other total dissolved solids is referred to as fresh water. Though seawater and brackish water are officially excluded, non-salty mineral-rich waters such as chalybeate springs are included.

Complete answer:
Ocean is not a source of freshwater:
The oceans' water is saline and not fresh. The salt and minerals from all the rivers that flow into the ocean are collected by the ocean's water. Rivers transport an estimated four billion tonnes of dissolved salts to the ocean each year around the world. Ocean water is particularly salty because it contains a lot of salts dissolved in it. The sea isn't a freshwater environment.
Freshwater sources:
1. Lakes, Rains, Ponds, Wells, and Glaciers are all sources of water.
2. Freshwater is necessary for life to exist, as it supports ecosystems and human civilizations.
3. Freshwater is used in many parts of daily life, such as food production, power generation, and so on.

So, the correct answer is “Option 4”.

Additional Information:
Fresh water is a finite, renewable, and fluctuating natural resource. The water cycle, in which water from seas, lakes, forests, land, rivers, and reservoirs evaporates, produces clouds, and returns as precipitation, is the only way to replenish fresh water. Locally, however, if more fresh water is eaten by humans than is naturally replenished, this can lead to a reduction in fresh water availability (or water scarcity) from surface and subsurface sources, as well as major environmental harm. The supply of fresh water is also reduced as a result of water contamination and consequent eutrophication.

Note:
Fresh water is not always potable water, or water that can be consumed. Without treatment, much of the world's fresh water (including surface and groundwater) is unfit for human consumption. Fresh water can readily become contaminated as a result of human activity or natural processes such as erosion.