The hydrosphere. The World Ocean
Answers are for parents and teachers.
1
Write the four oceans in order of size.
Pacific, Atlantic, Indian, Arctic.
2
An echo-sounder signal returned in 4 seconds. How many metres deep is it?
3000
3
The sea is 6000 m deep. In how many seconds does the signal return?
8
4
The ocean covers 71 % of the Earth. How many million km² is 71 % of an example area of 200 million km²?
142
5
Draw the water cycle with arrows in your notebook: ocean – vapour – cloud – rain – river – ocean.
The drawing should show a closed loop: evaporation from the ocean, cloud, rain, river and back to the ocean.