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.
Best Answer: Just to clarify, Biology IS a physical science. Physical science is a very broad term that encompasses earth sciences (geology, meteorology, and oceanography), xeno-sciences (ASTRONOMY, cosmology, etc.), biology, chemistry, physics, etc. So, yes, astronomy is a physical science.