You can determine density using mass and volume. The equation for that would be D=m/V, which is Density is equal too mass divided by volume.

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

What do we mean by the event horizon of a black hole?

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.