Tough Guys in the Pool
How well did you do?
1. The pool can become warmer
than the sea when the sun shines on it. The sea is larger so
takes longer to warm up.
2. The pool can become colder than the sea at night. The sea
takes weeks to change temperature.
3. The pool can become saltier than the sea when the water
evaporates. If all the water evaporated there would be a layer of
salt at the bottom of the pool.
4. The pool can become less salty than the sea when it rains.
5. The pool can have more oxygen than the sea during the day
because the seaweed makes oxygen.
6. The pool can have less oxygen than the sea at night when the
seaweed stops making oxygen but the creatures in the pool use up
the oxygen.