Oceanography and Hydrology

Brackish water occurs where fresh water and salt water mix, such as in estuaries. It has a salinity level higher than fresh water but lower than seawater.

Sea shells are biological structures created by marine organisms, which classifies them as natural materials.

Land ice, such as the massive ice sheets in Greenland and Antarctica, contributes significantly more to sea level rise than sea ice or smaller mountain glaciers when it melts into the ocean.

Rivers are a primary source of fresh water, whereas seas and oceans contain salt water.

Fresh water is the only type of water among the choices that is suitable for human consumption, as sea and salt water contain high levels of dissolved minerals.

Water has a high specific heat capacity, meaning it absorbs and releases heat slowly. This moderates the temperature of nearby land, leading to milder seasonal changes.

As you move away from the equator toward the poles, the intensity of solar radiation decreases, causing ocean surface temperatures to drop.

Surface water refers to water found in rivers, lakes, and reservoirs, which is easily visible and accessible on the Earth's surface.

Approximately 97.5% of Earth's water is saline and contained in the oceans, while only a small fraction is fresh water.

Rivers, streams, marshes, and lakes are all found on the Earth's surface. They are collectively referred to as surface water, as opposed to groundwater found beneath the surface.

The hydrosphere encompasses all water on, under, and above the surface of the Earth. This includes oceans, rivers, lakes, groundwater, and ice.

Ocean water contains high concentrations of dissolved salts, making it unsuitable for human consumption or agricultural irrigation without desalination. It is classified as salt water.

The ocean floor is not flat; it features complex topography including deep trenches, ridges, and underwater mountain ranges. These are collectively called ocean landforms.

Concentration refers to the amount of a substance (in this case, salt) per unit volume of a solution (the ocean water). Over time, evaporation has concentrated the salts in the ocean.