Question
prepare a model of the ocean floor.
✓
Answer
1. While studying the ocean floor, we must keep in mind the age of the ocean bed. By studying the deposits on the ocean bed, it occurred to the scientists that the deposits at the ocean floor are not older than 200 million years.
2. The maximum age of the rocks on the continents is supposed to be 3200 million years. Then where have the deposits on the sea bed which are older than 200 million years gone? This made the scientists restless. Then they started the study of the rocks along with the deposits.
3. This made them realize that the rocks are also not older than 200 million years. It was inferred that the ocean floor is very young as compared to the earth’s surface. Now this is unanimously accepted. This research was then used in the study of the concept of plate tectonics.
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
(1) Where did a container full of toys fall on 10th January, 1992?
(2) Where did some of the toys reach on 16th November, 1992?
(3) Where did some of the toys reach by the year 2000?
(4) Where did some of the toys reach by the year 2003?
(5) Where did some of the toys reach by the year 2007?
(6) Why did the toys travel in this way?
What are the problems in areas of high population densities?
(1) Name the industry at Jamshedpur.
(2) Which raw material is required for this industry?
(3) From which areas is this raw material obtained?
(4) Why is coal used in this industry?
(5) State with reasons if it would be feasible to set up an iron and steel industry in your district.
The vapour-holding capacity of 1 cu.m, of air in various temperature is given in the following table.
Calculate the difference in the capacities by observing the following table :
(Note: The answer is given directly.)
(1) How does the Humboldt current affect the climate of the South America?
(2) In which oceans are counter equatorial currents not observed and why?
(3) Which currents are absent in the northern part of the Indian Ocean and why?
(4) In which regions do the cold and warm ocean currents meet?
Magnetic pole and equator
(1) Correlate their land use and development.
(2) Which land use is found in Japan?
(3) Considering the land use in both the countries, make a list of factors affecting land use.
Do this activity when you go to the seashore with your parents or teachers. Observe the materials which have come with the waves. Classify them as per the flowchart given below:
(1) Which of these are perishable items?
(2) Which are non-perishable?
(3) What will happen because of perishable items?
Do this activity when you go to the seashore with your parents or teachers. Observe the materials which have come with the waves. Classify them as per the flowchart given below:
(1) What will happen because of non-perishable items?
(2) Suggest measures to control deposition of non-perishable items on the coast.
(3) How will you run a campaign of environmental conservation to keep the coasts clean?
(1) Which are the land uses of 1990-91 that show decline in 2010-11? What could be reasons for this?
(2) Which type of land use is the maximum? What would be the impact of this on India’s environment?
(3) Can a decline in the area under agriculture equated with food shortage?