Type the number

Exercise and reference answers

Questions

1. Answer

   55

   Question

   Percent of Earth's surface covered by oceanic crust

2. Answer

   2900

   Question

   Kilometres deep at which the core begins

3. Answer

   7000

   Question

   Diameter of Earth's core in kilometres

4. Answer

   1920

   Question

   Year Wegener made the case for continental drift

5. Answer

   5

   Question

   Centimetres per year that rifts separate on average

6. Answer

   60

   Question

   Kilometres of active rifts identified, in thousands

Instructions

Type the number only.

Explanation