Which type of lens would you use in a microscope or telescope and why?

Microscopes and telescopes often use two lenses to make an image large enough to see. A compound microscope uses two lenses to achieve high magnification. Both lenses are convex, or converging. Light from the object first passes through the objective lens.

Explanation:

A compound microscope uses two lenses to achieve high magnification

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.