Earth's magnetic field is generated by

gravitational forces at the poles

exchange of gases at the poles

the movement of electrical charges inside earth

chemical reactions in the van allen radiation belt

Write formulas for the following compounds: potassium iodine, phosphorus pentachloride, magnesium hydroxide, aluminum sulfate, dichlorine heptoxide, and calcium nitrate trihydrate.

If the partial pressures of the three gases in the tank are 38.39 atm of O2, 3.38 atm of He, and 25.33 atm of N2, what is the total partial pressure in the tank

Which of the following is NOT a scalar quantity A. 40 m/s B. 40 m North C. 40 m D. None of the above

An object has a mass of 250g what is the gravitational force of on the object by the earth

A baseball travels 50 meters in 4 seconds what is the average velocity of the baseball?

A standing wave is established in an organ pipe that is closed at one end. What is located at the open and closed ends of the pipe?

When all parts of a circuit are composed of conducting materials, the circuit is said to be A. parallel. B. closed. C. open. D. shorted.

You travel an an average speed of 20 km/h in a straight line to get to your grandmothers house. It takes you 3 hours to get to her house. How far away is her house from where you started?

A boat with an anchor on board floats in a swimming pool that is somewhat wider than the boat. Does the pool water level move up, move down, or remain the same if the anchor is (a) dropped into the water or (b) thrown onto the surrounding ground

In July 2005, NASA's "Deep Impact" mission crashed a 372-kg probe directly onto the surface of the comet Tempel 1, hitting the surface at 37,000 km/h.