English Typing Test - The Water - We Drink
English Typing Test
Water: The Essence of Life on Earth
Water covers about 70% of Earth’s surface and is essential for life. It exists in all three states of matter gas, liquid, and solid and shapes our planet's climate.
A View of Earth from Space
This photograph of Earth, taken by the Apollo 17 crew on December 7, 1972, shows an area from the Mediterranean Sea to Antarctica. Water is visible in the Atlantic, Indian, and Southern Oceans, as well as in the polar icecaps and as cloud cover in the southern hemisphere.
The Water Cycle: Always in Motion
Water exists naturally on Earth in all three physical states: gas, liquid, and solid. Liquid water in oceans and rivers absorbs energy from the sun, evaporating into the atmosphere as water vapor. As it rises, it cools, condenses into droplets, and forms clouds. These droplets can combine, fall as precipitation, and return to the Earth to continue the cycle.
Water’s Role in Climate Regulation
Water vapor is a key greenhouse gas that traps heat radiated from the Earth's surface, helping to maintain temperatures that support life. Water vapor contributes to over half of the planet’s greenhouse gas warming. At the same time, clouds and ice reflect sunlight, which cools the planet. This complex interaction between water in the atmosphere and Earth's climate is difficult to model and predict.
Water: Unique and Essential for Life
Water is colorless, odorless, and tasteless, and it is so common that we often take it for granted. Most plants and animals contain more than 60% water by volume. Without water, life would not have evolved on Earth. The presence of water on Mars and some moons of Jupiter and Saturn fuels speculation about past or present life beyond Earth.
The Surface Tension of Water
Water has the second highest surface tension of all common liquids, only behind mercury. This is due to the intermolecular forces between water molecules. The surface molecules are attracted inward, creating a stretched elastic film. This effect causes water droplets to form spherical shapes, as the sphere has the smallest surface-to-volume ratio.
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