Fill in the blanks with the words from the box. You may need to change the forms of some of  words Yon may need to use one word more than once.

forces

water

objects

full

important

clothes

in

the

made

currents

 The world is (a) ----- uncountable natural and man (b), air and (d) of  objects. Natural (c)are stones, trees, air and (d) ---- . Man-made objects are houses, cars. (e) ------ and chemicals. Natural (f) ------ are cyclones, earthquakes, volcanoes, storms and  ocean (g) ------ Life exists (h) ------ different conditions. It is very (i) ----- to keep (j) ----- environment clean.