Assertion and reason

Exercise and reference answers

Questions

1. Reason

   No drilling reaches beyond the outer crust, so waves and eruptions carry the evidence.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Our knowledge of the deep interior is indirect.

2. Reason

   They bring molten rock from beneath the crust to the surface.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Volcanoes tell us something about the material below.

3. Reason

   The crust is thin compared with the layers below it.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   The mantle is the outermost layer.

Explanation