Yes they do. Coffins made out of any type of wood without being reinforced with a much stronger material would collapse within a matter of days. Even a steel coffin is deformed by the weight of the dirt above. Also in a climate where it is more likely to rain (such as northern Europe), a coffin can collapse on the same day if not reinforced due to the moisture in the soil.
It prevents the weight of the dirt from crushing the lid.
Your weight is the result of the force of gravity. Without gravity you would be weightless and would float away. This does not happen on the top of mountains. Because you are farther from the center of the Earth, your weight is slightly less on top of a mountain, but compared to the diameter of the Earth, mountains are quite small, and the difference in weight is very slight, and would not even be noticed. So yes, you feel gravity on top of a mountain.
At the top of a high mountain, or in an airplane at high altitude, you are farther from the center of the earth,and your weight is less.
To ensure that the ground underneath the skyscraper can support the weight of the building on top of it. Otherwise the skyscraper will collapse and implode in on itself.
caldera
Caldera
First off your mass is the same, it will no t change no matter where you are. Your weight however depends on the distance between your center of mass and the center of mass of the earth ( and to a very small extent on the bouyant forces of the atmosphere) So at sea level the force of gravity between you and the earth (your weight) is: F=G x m1x m2/D2 where F is essentially your weight, G is the universal gravitational constant, m is your mass and m2 id the mass of the Earth and D is the distance between you and the center of the Earth. At the top of Everest you are 8.84 km further from the center of the Earth (Earth's radius)so: FTop/Fsealevel = D2sealevel/D2 Top = (6378.1km)2/(6378.1km + 8.84km)2 (about 99.7% of your initial weight)
Your weight is not one-quarter as much when you climb to the top of a tree twice as tall as you are because your weight does not change when you move around within earth's gravitational field. You would have to move to outer space or to another planet to have your weight change.
No.
It can. The top portion of a stratovolcano can become unstable and collapse or may be blasted away by explosive eruptions.
Because as you get closer to the surface of the earth, the more air that is on top of you. At the top of the atmosphere, there is no air, and everything is a vacuum, where you have no weight. When you get close to the earth, the weight of the air builds until it when you're at the very lowest point of the earths surface, all the air in the atmosphere above you is pressing down.
Humans live on the Earth's surface so, therefore, you are on top of the Earth on its crust.