A theodolite works by combining optical plummets (or plumb bobs), a spirit and graduated circles to find vertical and horizontal angles in surveying. An optical plummet ensures the theodolite is place as close to exactly vertical above the survey point.
hope it helps XD
<span>The question is asking us to determine the region where moved the Khmer and Mon peoples from 800 to 1200. The Khmers are very old ethnic group that came into Southeast Asia at the same time as the Mon people. They were builders of the Khmer Empire in Cambodia ( 802 - 1431 ). Answer: They moved into the northern regions of A ) Cambodia.</span>
<span>All physical forms of water:solid, liquid, and gas on or near the earth's surface make up the HYDROSPHERE</span>
