How many major plates do scientists estimate the earth has? how can a plate have both oceanic and continental crust? fast fast fast

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun