Complete the lake turnover rule

Exercise and reference answers

Missing parts

1. Answer

   four

   Choices

   1. zero
   2. four
   3. ten

2. Answer

   sinks

   Choices

   1. sinks
   2. floats
   3. freezes

3. Answer

   poor

   Choices

   1. poor
   2. rich
   3. free

Complete the statement

Water is densest at {0} degrees Celsius, so in autumn the cooling surface water {1} and displaces the bottom water, which is oxygen {2}.

Instructions

Tap a word for each blank to complete the rule.

Explanation