Type the number

Exercise and reference answers

Questions

1. Answer

   98

   Question

   Per cent of the crust made of eight elements

2. Answer

   8

   Question

   Number of elements making up most of the crust

3. Answer

   2000

   Question

   Minerals named and identified, at least

4. Answer

   10

   Question

   Hardness of diamond on the scale

5. Answer

   6

   Question

   Major rock-forming mineral groups

6. Answer

   3

   Question

   Rock families by mode of formation

Instructions

Type the number only.

Explanation