All+About+Energy!

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The word geothermal comes from the Greek words //geo// (earth) and //therme// (heat). So, geothermal energy is heat from within the Earth. We can recover this heat as steam or hot water and use it to heat buildings or generate electricity.Geothermal energy is a renewable energy source because the heat is continuously produced inside the Earth.Geothermal energy is generated in the Earth's core. Temperatures hotter than the sun's surface are continuously produced inside the Earth by the slow decay of radioactive particles, a process that happens in all rocks. The Earth has a number of different layers:The Earth's crust is broken into pieces called plates. Magma comes close to the Earth's surface near the edges of these plates. This is where volcanoes occur. The lava that erupts from volcanoes is partly magma. Deep underground, the rocks and water absorb the heat from this magma. The temperature of the rocks and water gets hotter and hotter as you go deeper underground.People around the world use geothermal energy to heat their homes and to produce electricity by digging deep wells and pumping the heated underground water or steam to the surface. We can also make use of the stable temperatures near the surface of the Earth to heat and cool buildings.====== Renewable energy is energy that can be used more than once. Non Renewable energy is energy that can only be used once. Renewable energy: Biomass, Solar, Geothermal and Wind. Non Renewable Energy: Coal, Oil, Wood and Natural Gases. The sun has produced energy for billions of years. Solar energy is the sun’s rays (solar radiation) that reach the Earth. This energy can be converted into other forms of energy, such as heat and electricity.Solar energy is by far the Earth's most available energy source. Solar power is capable of providing many times the total current energy demand. But it is a broken energy source, meaning that it is not available at all times. However, it can be enhanced by thermal energy storage or another energy source, such as natural gas or hydropower.

Energy forms are either **potential** or **kinetic**. **Potential** energy comes in forms that are stored including — chemical, gravitational, mechanical, and nuclear. Kinetic energy forms are doing work — like electrical, heat, light, motion, and sound. Energy comes in different forms: Heat (thermal) Light (radiant) Motion (kinetic) Chemical Nuclear energy Gravitational. Energy is in everything. We use energy for everything we do, from making a jump shot to baking cookies to sending astronauts into space.There are two types of energy:Stored (potential) energy ,Working (kinetic) energy.

During the day, the air above the land heats up more quickly than the air over water. The warm air over the land expands and rises, and the heavier, cooler air rushes in to take its place, creating wind. At night, the winds are reversed because the air cools more rapidly over land than over water. In the same way, the atmospheric winds that circle the earth are created because the land near the Earth's equator is heated more by the sun than the land near the North and South Poles. During the day, the air above the land heats up more quickly than the air over water. The warm air over the land expands and rises, and the heavier, cooler air rushes in to take its place, creating wind. At night, the winds are reversed because the air cools more rapidly over land than over water. In the same way, the atmospheric winds that circle the earth are created because the land near the Earth's equator is heated more by the sun than the land near the North and South Poles.

Hydropower is the renewable energy source that produces the most electricity in the United States. It accounted for 6% of total U.S. electricity generation and 67% of generation from renewables in 2008. Understanding the water cycle is important to understanding hydropower. In the water cycle: Solar energy heats water on the surface, causing it to evaporate.This water vapor condenses into clouds and falls back onto the surface as precipitation (rain, snow, etc.).The water flows through rivers back into the oceans, where it can evaporate and begin the cycle over again.