By using prefixes, we can write 32 × 10-10 kg as

3.2 micro gram

Explanation:

because

1kg=1000g

32×10^-10kg=?

=3.2×10^-6g

1g=10^-6micro gram

3.2×10^-6g=?

=3.2 micro gram.

where g- gram

kg- kilogram

6.4 cm (max) - 25 cm (min)

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.