*Question*
Warm air is less dense than cool air, so it rises higher in the troposphere.  Warm air is able to fill more space than cold air because it is more dense or less dense?
**Answer**
less dense

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

*Question*
Gluons make quarks attract each other more strongly the farther apart the quarks get.  When there are low levels of gluons in quarks it becomes weaker or stronger?
**Answer**
weaker

*Question*
The more basic a solution is, the closer its pH value will be to 14.  If Jim decreases how basic his solution is, it means the solution proximity to pH 14 is decreased or increased?
**Answer**
decreased