Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Learning to get used to something after being exposed to it for a while is associated with habituation learning.
Learning to get used to something after being exposed to it for a while is associated with what kind of learning?

Pangaea began breaking apart 250 million years ago.
How many millions of years ago did pangaea begin breaking apart?

When scientists work in natural settings rather than a lab, it is called fieldwork.
When scientists work in natural settings rather than a lab, it is called what?