Type the number

Exercise and reference answers

Questions

1. Answer

   75

   Question

   Per cent of Earth's surface covered by water

2. Answer

   78

   Question

   Per cent of air that is nitrogen

3. Answer

   97

   Question

   Highest per cent of carbon dioxide on Venus and Mars

4. Answer

   190

   Question

   Degrees below zero on the Moon at its coldest

5. Answer

   110

   Question

   Degrees Celsius on the Moon at its hottest

6. Answer

   2

   Question

   Times carbon dioxide has risen since the industrial revolution

Instructions

Type the number only.

Explanation