1st

• The Water Cycle is a continuous natural cycle that involves the fall and movement of water.
• Evaporation is the change of liquid water into water vapor, allowing water to move from oceans and lands to the atmosphere.
• The Sun's energy evaporates water from oceans and rivers, drawing it upwards as water vapor.
• Condensation is a process where water vapor is turned into liquid water, as the water vapor rises and reaches cooler air, it condenses and forms clouds.
• Precipitation is when the moisture in the clouds eventually falls back down to Earth in the form of rain or snow, replenishing the water in the oceans and rivers.
• Water is a chemical compound with the molecular formula H₂O, which signifies that each molecule of water consists of two hydrogen atoms (H) and one oxygen atom (O), it is a tasteless, odorless, and nearly colorless substance in its purest form.
• About 71 percent of the Earth's surface is water-covered, and the oceans hold about 97 percent of all Earth's water.
• Water that contains a high concentration of dissolved salts (mainly sodium chloride) is known as saltwater.
• Water containing less than 1000 mg/L of dissolved solids, most often salt, is known as freshwater.
• Surface water is any body of water found on the Earth's surface, including both the saltwater in the ocean and the freshwater in rivers, streams, and lakes.
• Salt water is water that contains dissolved salts and other minerals, and human beings and other land animals can not survive by drinking salt water.
• A lake is a body of water that is surrounded by land.
• A river is a large, natural stream of flowing water.
• A wetland is a land area where water covers the surface for significant periods of time.
• A marsh is a shallow wetland around lakes, streams and oceans where grasses and reeds are the dominant vegetation.
• A swamp is a forested wetland, for example, mangrove swamps are coastal wetlands.
• An estuary is a partly enclosed coastal body of water where freshwater from stream meets the saltwater from the sea.
• A glacier is a large mass of ice that forms from the accumulation and compaction of snow.
• Groundwater lies under the surface of the land, where it travels through and fills openings in the rocks, these rocks that store and transmit groundwater are called aquifers.
• Groundwater is important in normal body functioning, agriculture, household consumption, habitat, recreation, and electricity generation.