Question

B. Fill in the blanks.

1. The average thickness of the lithosphere is about ______ km.
2. Freshwater is made available on land through the process of _______.
3. The word biosphere comes from a __________ word 'bios', meaning.
4. The greatest danger to the environment is from _______.​

Answer 1

1. 100km
2. water cycle
3. greek word 'bios' meaning life
4. humans

Answer 2

Answer:

1. 40 km
2. Water cycle. Fresh water is a renewable and variable, but finite natural resource.
3. The word Biosphere is derived from Greek words 'bios' which means life and 'sphaira' meaning sphere.
4. The greatest danger to the environment is human because they not only exploit natural resources but also take little step for thieir conservation n reuse.