Because of water's fluid molecular composition, it takes longer to heat and cool than land, which has a molecular structure that is more static and dense. Convective movements and the thermal capacities of bodies of water cause them to have a longer heat and cool time than land. Additionally the typically darker color of land gives it a higher propensity to trapping heat.Know More
Because water is a liquid, its molecules are in greater motion than those of land, a solid. Like air, water is prone to convective movements and vertical mixing. Because water molecules are in constant motion, it takes longer for solar radiation to uniformly raise the temperature of a given body of water.
Large bodies of water like oceans have higher thermal capacities than land due to their immense density. As a result, it takes up to four times the amount of heat to raise the temperature of a given amount of water 1 C as it takes to raise the temperature of the same amount of land by an equivalent degree.
Color is also a factor. Because water is lighter than land, it reflects more solar radiation and does not heat as quickly.
Sunlight penetrates many meters into a body of water, whereas it only hits the upper, superficial portion of land. That is why it takes longer for water to cool than it does for land.Learn More
Ocean water is salty primarily due to the large amounts of chloride and sodium on land which are dissolved by rainfall and carried to the sea by rivers and streams. Hydrothermal vents and underwater volcanoes located on the seabed also contribute dissolved salts to the ocean.Full Answer >
Around 3 trillion tons of ocean water is evaporated each day, much of it from the heat of the sun. The rate at which water evaporates depends on several factors.Full Answer >
Plant life first appeared on land during the Ordovician period, between 495 and 443 million years BCE. One 2001 study from Penn State University claims that plants and fungi first appeared on land 700 million years BCE, but this has not yet become accepted by the larger scientific community.Full Answer >
Deforestation is clearing away woodlands to use the cleared land for other uses. Deforestation happens to all types of woodland, including jungle and rain forest. The land is often used for farming or urban development.Full Answer >