Answer:
the formation and evolution of stars and galaxies
Explanation:
One of the topic an astronomer will most likely study is the formation and evolution of stars and galaxies.
Astronomers are scientists that studies the universe, its components and how it works.
- An environmental scientist is concerned with pollution on a local river.
- A civil engineer is specializes in designing structures that can withstand earthquake damage.
- A biologist will observe the movement of dolphins.
Density of any substance can be measured using the following rule:
density = mass / volume
Since in this question, the volume of mercury is equal to the volume of water but still the mass of mercury is greater than the mass of water.
Therefore, by substituting in the density equation, we will conclude that mercury is higher density than water.
The answer is:
<span>Mercury is denser than water</span>
Fossil Fuels give off energy when they are burned
One valuable fossil fuel is natural gas. It is a cleaner-burning fuel source.