(Q).
The upper rock layers are much younger.  Sarah is looking at layers of rock on a cliff face. She can see that the rock at the very top of the cliff are older or younger?
(A).
younger


(Q).
The higher up a food chain that humans eat, the greater the levels of toxic metals they take in.  Mike is studying what humans eat. Bears are higher up the food chain than mosquitoes. Therefore, if humans were to eat mosquitoes, they would likely be taking in less or more levels of toxic metals?
(A).
less


(Q).
As the Universe expands, galaxies move further and further apart.  When a city contracts the distance across the city decreases or increases?
(A).
decreases