Question

How many elements are present in earthcrust?

Answer 1

there are 92 elements that are naturally found but only eight of them are common in the rocks that are present in earthcrust...hope this will help.

Answer 2

there are 92 elements which are natural there are only 8 elements which make the earth crust  so 92 elements and the 8 elements together make 98% of the outer layer which is crust