Question
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.
✓
Answer
The man digging a pit could dig with ease initially because of the presence of topsoil and subsoil (mainly comprising cl humus and nutrients). But as he digs deeper, he finds it difficult to dig beyond a depth of $5$ feet as lower layers are made up of small partially weathered rocks with cracks, crevices and with bedrock which make it hard to dig.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The smallest time interval that can be measured with commonly available clocks and watches is one second. However, special clocks are available that can measure time intervals smaller than a second. Some of these can measure time intervals as small as one millionth or even one billionth of a second.
1. A micro-second is a very small time interval. Write its value in fraction of a second.
2. Define time period.
3. What is the basic unit of time?
1. A micro-second is a very small time interval. Write its value in fraction of a second.
2. Define time period.
3. What is the basic unit of time?
A girl was suffering from cold and was sneezing continuously. She joined her family at dinner and suddenly started sneezing without covering her nose, thus spreading particles all over the place.
On realising her mistake, said sorry and next time covered her nose.
(i) During sneezing, what are the precautionary steps to be followed?
(ii) Is sneezing a respiratory process?
On realising her mistake, said sorry and next time covered her nose.
(i) During sneezing, what are the precautionary steps to be followed?
(ii) Is sneezing a respiratory process?
Give the difference between weather and climate.
Briefly explain what are cyclones and how are they formed.
Is air essential for combustion? Explain with the help of an activity.
Write the difference between rate of percolation and the amount of water retained.
Draw and colour a picture showing items made from metals and non-metals in your home.
Zubeda made an electric circuit using a cell holder shown in Figure, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit.
Why is transport of materials necessary in a plant or in an animal? Explain.
Give a brief account of process of digestion of different nutrients in human being.