Hydrosphere

Which describes the total amount of saltwater on Earth?

• 1%

• 3%

• 75%

• 97%

Which best describes the amount of usable freshwater on Earth?

• 1%

• 3%

• 75%

• 97%

Water from aquifer is cleaner compared to water from other sources. Why?

• it becomes clean when fresh and saltwater meet

• it comes directly from precipitation

• it rises to the surface near the ocean

• it is filtered by the rocks and soil

Which statement best describes a river basin?

• the land drained by a river and its tributaries

• the land formed when rivers create estuaries

• the land at the mouth of the river

• the land formed after flooding

Urban sprawl is the rapid expansion of cities and towns. How does it affect water availability?

• It lessens the demand for water

• It deepens the wells that provide more water supply

• It changes the shape of the land which changes the watersheds too

• It builds neighborhoods that increases water reservoirs

Aquifer pollution is more dangerous than pollution in other bodies of water. Why is that so?

• It takes a long time for water to clean itself since it is moving slowly in an aquifer.

• It is difficult to see chemicals in aquifers since they are invisible compared to visible chemicals in larger bodies of water.

• It affects the organisms living in bigger bodies of water as water leaves quickly in aquifers.

• It contains chemicals with bad odor that makes the flavor of water bad too.

Which statement correctly compares river basins and watersheds?

• There are many watersheds that drain into a river basin.

• There are many river basins that drain into a watershed.

• Both river basin and watershed are the same.

• Only a few areas are drained by river basins while others are drained by watersheds.

Among the freshwater given, which is the primary source in the hydrosphere?

• groundwater

• lakes

• glaciers and ice caps

• ocean

Which characteristics do a rock must possess in order for it to become an aquifer?

• porous yet impermeable

• non-porous and impermeable

• porous and permeable

• non-porous yet permeable

Which of the following could result in the drying up of a river basin?

• increased evaporation and increased precipitation

• decreased evaporation and increased precipitation

• increased evaporation and decreased precipitation

• decreased evaporation and decreased precipitation