instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Glaciers deposit their sediment when they melt.
answer:
When do glaciers deposit their sediment?


question:
Metallic bonds gives a coil of copper wire the ability to conduct electricity well.
answer:
What gives a coil of copper wire the ability to conduct electricity well?


question:
Planting new trees where old ones were cut down of these human activities in a forest has a positive effect on the ecosystem.
answer:

Which of these human activities in a forest has a positive effect on the ecosystem?