Second hand smoke contains both the <span>smoke that comes from a cigarette and smoke breathed out by a smoker. Anyone who are exposed to this is no excuse of acquiring health problems such as cancer, heart disease and breathing problems. So the things that you should do to solve the problem of exposure to your mom's secondhand smoke in the house is to explain to your mom how it has been bothering you and the possible risks that it will give. If not, ask your mom to limit smoking or to assign a certain area where she can smoke. But, the best thing that you should do is to help your mom realize how bad smoking is for her health and also for the people around her.</span>
Explanation: Excavations and trenches are basically the man-made cuts inside the Earth's surface. These are made for multiple purposes such as mining or tunneling. One of the obvious risk while working in such excavations and trenches is cave-ins. It is basically collapse of that excavation or Trench. The roof of the mine collapses and people working under it get buried inside those excavations in trenches.
