Which of the following causes a precipitate to form?

A. Atoms combining in a solution to form a solid

B. Volcanoes erupting and magma cooling

C. Lava crystallizing

D. Minerals undergoing changes in pressure

Unbalanced contact forces between several objects would result in A. one of the objects moving B. all of the objects moving C. at least one of the objects moving and possibly all of them moving D. none of the objects moving

Where does the energy of an earthquake originate? A. Movement of tectonic plates B. the building of volcanoes C. Earth's magnetic field

In a series circuit, the voltage across the circuit is always equal to a. the voltage across one of the bulbs. b. the sum of the voltages across each bulb. c. half the sum of the voltages across each bulb. d.

Calculate the average speed of a bicycle that travels 100m in 20 s.

To demonstrate refraction, Emily's teacher places a glass rod in water. The glass in the water will appear

Which device would a sleep researcher use to monitor a sleeping person's brain waves?

An experiment is performed to obtain the value of a physical property. If the true (i. e., correct) value of the property is 50 and the measured (i. e., experimental) value is 32, the percent error of the experimental result is:

White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot.

What two factors determine how fast weathering occurs

A sound that's produced by a single wave at a constant frequency and with no overtones is called