2. explain how to focus a microscope using the high power lens. include any safety issues you need to be aware of such as for the focus adjustment knob.

While using microscopes, one need to take many precautions.

To view any slide on higher resolution, all the focal adjustments should be done with scanning lens. After adjusting the focus with the scanning lens, turn the lens knob to higher resolution. Make sure, you move the lens in such a way that it does not break the slide.

in case, the view of the slide is not clear, then use fine adjustments only. On higher power lens, do not try to adjust focus adjustment knob, as it can break the slide. Before keeping the slide on a microscope, make sure all lenses are clean and the platform is also clean.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.