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Solar Energy Review

Solar Energy Review. Why does the position and length of a shadow change throughout the day?.

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Solar Energy Review

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  1. Solar Energy Review

  2. Why does the position and length of a shadow change throughout the day? • As the Earth rotates throughout the day, the relative positions of the sun and Earth change. The sun is the primary light source for shadows, and if the light source is changing positions, then the shadows will change.

  3. How does a thermometer work? • Thermometers work on the principle that the volume of a liquid increases as it is heated and decreases as it is cooled. The bulb thermometer contains a fluid, usually colored alcohol, which expands when it is heated.

  4. How does a compass work? • The earth has a magnetic field deep inside the core which attracts the needle on the compass so that it will always point to the north.

  5. How is a shadow created? • A shadow is made when an object blocks a light source from traveling through it.

  6. Vocabulary Shadow - the dark area created by an object that blocks light

  7. Vocabulary Compass - an instrument used to determine direction; the needle in a compass always points to magnetic north Sun - a star around which Earth and other planets revolve; it furnishes heat, light, and energy

  8. Vocabulary Thermometer - A thermometer is a tool to measure temperature. It has a thin glass tube filled with colored alcohol. As the alcohol warms, it expands and travels up the tube. When the alcohol cools, it contracts and goes back down the tube. To use the thermometer, you put the bulb in the fluid (liquid or gas) to be measured for temperature.

  9. Vocabulary Earth Material - A nonliving substance that makes up or comes from the earth Energy transfer - The change of energy from one form to another, or the movement of energy from one object to another

  10. Vocabulary Heat sink - A material, such as water, that can absorb a large amount of heat for its volume and release energy slowly Solar Energy - Energy from the Sun; this energy takes several forms, including visible light and infrared light that can be felt as heat

  11. Vocabulary Absorb - to take up, soak in, or capture (black plastic absorbs the Sun’s energy) Reflect - to bounce back (white plastic reflects the Sun’s energy) Solar Collector - a material used to capture solar energy in a water heater or other device

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