A sound wave is made of a series of compressions and

a.

extensions.

c.

rarefactions.

b.

volumes.

d.

refractions.

A factory wants to build a big tank to store chemicals. The tank will be near a river. Which of the following is a possible result of building a chemical tank?

Training only a few muscle groups leads to imbalances and an increased risk of injury.

What kind of energy source transforms heat energy from the Earth into mechanical and electrical energy? a. Geothermal c. Solar b. Hydro-electric d. Turbine

Approximately what is the gravitational energy of a 100 kg person at the top of a 10 meter ladder?

What is true of the waste generated by nuclear power? Remains hazardous for a long time. Creates acid rain. Increases greenhouse effect. Cause air pollution.

Which actions are evidence that a chemical reaction has occurred? Check all that apply. A: a change in color B: the formation of a precipitate C: a clear liquid becoming cloudy D: a change in shape E: the formation of bubbles F: the formation of

Which sphere forms Earth's outermost layer? Atmosphere Biosphere Cryosphere Hydrosphere

an 100kg object traveling at 50m/s collides (perfectly inelastic) with a 50kg object initially at rest. what is the sum of the momentum of both objects prior to the collision?

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion