Science Homework Answers & Questions Page 911

• What causes the Northern Lights on earth?

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• When did the Silurian Period begin?

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• What is subduction?

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• Which layer of the sun has the highest temperature?

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• What are the forms in which carbon is found in the oceans?

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• How many galaxies are there in the universe?

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• How did life begin according to science?

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• What is the difference between a pulsar and a quasar?

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• How many moons does Uranus have?

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• What is the circumference of the sun at its equator?

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• What is a caldera? How are they formed?

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• How long did it take astronauts to reach the moon?

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• What is the earth made of in percentages?

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• How do quasars differ from stars?

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• How big is the moon compared to the Earth?

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• How does gravity work in water?

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• How many planets are between earth and the sun?

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• How many people have been to the moon?

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• Stalactites and stalagmites are usually made up of the mineral calcite. This mineral dissolves easily in acidic water. How do you think calcite hardened to form the features in the cave?

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• What is the name of biggest planet in the universe? Where is it and who discovered it?

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• Why are sedimentary rocks the only rock type to contain fossils?

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• How many stars have been observed in our solar system?

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• What is the nearest galaxy?

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• Where is the Moon in its orbit at the time of a solar eclipse?

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• What is the tropopause and what is significant about it?

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• What is the biggest planet in our galaxy?

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• How is nuclear fusion in a main-sequence star different from nuclear fusion in a giant star?

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• What is an oxbow lake and how is it produced?

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• How long do humans live in reference to the time scale of the universe?

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• How do the relative positions of Earth, the moon, and sun cause the phases, tides, and eclipses, and determine time on Earth?

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• What is GPS and how does it work?

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• What are the differences of interference color and birefringence ?

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• What is the lowest point on earth?

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• How long does it take Saturn to orbit the sun?

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• What is one example of a transform boundary?

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• What is the biggest difference between the upper and lower mantle?

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• How are sedimentary rocks formed and what are some examples?

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• What does NASA mean when they say an image is false color?

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• Why is Venus called Earth's "sister planet"?

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• What are examples of electromagnetic force?

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• What is the distance between Venus and the sun?

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• What is fusion? What elements are involved in this reaction in the sun?

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• What does the omega sign mean in physics and cosmology?

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• What are three examples of shield volcanoes?

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• What is the radius of sun and earth?

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• How was the Grand Canyon formed?

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• How far is Pluto from the sun in miles, kilometers and feet?

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• What is the difference between a perihelion and a aphelion?

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• How long would it take light from the sun to reach Eris?

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• What is the Asthenosphere?

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