Answer the question below:   When we look deep into the earth through a volcano the temperature decreases or increases?    Assuming that:  As the rocks move deeper into the Earth, temperature and pressure increase.
increases

Answer the question below:   Erin was going to see the elephants in the jungle. If the jungle is larger than it was 20 years ago, then what has likely happened to the population of the elephants it has decreased or it has increased?    Assuming that:  The forest habitat of elephants has also decreased in size due to humans moving in, so the numbers of the elephants have decreased.
it has increased

Answer the question below:   When water loses salt the water becomes more dense or less dense?    Assuming that:  If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser.
less dense