Class 7 Chapter 1 Solution
THE BOOK OF NATURE
Short Question Answer
(a) What must we do to know about the tale of this world?
Ans. We must read the books written by the scientists and those who have studied a great deal. We should study the rocks and the fossils to know about the story of this world.
(b) How old is our earth?
Ans. Our earth is very, very old-millions and millions of years old.
(a) Which are the things around us that tell us about the earth’s early tale?
Ans. We have rocks and mountains and seas and stars and rivers and deserts and fossils of old animals around us and these things tell us about the earth’s early story.
(b) Why does a pebble have a smooth surface?
Ans. A pebble has a smooth surface because it rolls at the bottom of the river and its edges are worn away and its rough surface become smooth and shiny.
(c) How does a pebble become grains of sand?
Ans. A pebble is carried by the river and it becomes smaller and smaller till at last it becomes grains of sand.