1. Why is wood used in saunas?

It looks nice.
It is natural.
It conducts heat very weakly.
It conducts electricity very well.
It conducts electricity very weakly.

2. What is the most common raw material used in paper?

quartz sand
crude oil
PVC plastic
coal
cellulose from wood

3. What types of materials can be used to make paper?

plastics
fibers
rocks
wasp spit
oils

4. Which animal can also produce paper?

bee
silkworm moth
ant
wasp
bumblebee

5. Which of the following animals does not produce wool?

camel
goat
cow
sheep
vicuna

6. Crude oil and natural gas have been formed

by electricity.
in oil refineries.
from ancient marine organisms.
from limestone.
from oil spills.

7. Coal has been formed

in grills.
from ancient plants.
from granite and quartz
in supernovas.
from burnt rock.

8. What is the characteristic feature of plastics?

They decomposes easily.
They conduct heat and electricity well.
They have long molecular strands.
They have short molecular strands.
They are made from quartz sand.

9. Which plastic is used to make plastic bags?

PE plastic
PET plastic
PS plastic
PP plastic
PVC plastic

10. Which of the following substances is used as a raw material in concrete?

crude oil
coal
natural gas
plastics
chalk