A man digging a pit found that he could dig with ease initially but digging became difficult as he went deeper. He could not dig beyond a depth of 5 feet. Provide a suitable scientific explanation.
Answers
When the man started to dig the pit he was having more energy so he was able to dig the pit with ease. But as he continued to dig the pit he gradually started losing his energy. As he reached a depth of 5 feet his energy completely exhausted so he could not go any further deep.
This is one reason why he was unable to dig beyond 5 feet.
As tree are exist on the surface and there root can go not so deeper but the area of earth surface that came into contact of nature is not so deeper and the upper surface of eath became loosen due to roots,and some external forceses and thus,easy to dig but the inner surface of earth are not came into contact of external force so,it is harder to dig it as compared to upper surface because it is made with rock.
And this can be the other reason..