People can fall: â  from the edge of a completed roof; â  from the edge where work is being carried out; or â  through openings or gaps. Edge protection Unless the roof parapet provides equivalent safety, temporary edge protection will be required during most work on flat roofs.
Why is astronomy considered the original science? Astronomy is the oldest science for our ancients either drew or made structures according to seasons or movements of celestial bodies in our Universe.
Skip to the Questions. At first it might not seem like the study of Earth would be an important part of astronomy. However, Earth is part of our solar system neighborhood, and many things happening on Earth are directly related to other objects in the solar system. Credit: NASA/NOAA/GSFC/Suomi NPP/VIIRS/Norman Kuring Blue Marble 2012.