Select the correct answer. In this drawing, which layer of rock is the oldest?

A.
layer 1
B.
layer 2
C.
layer 5
D.
layer 6

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Which of these conditions most likely produces an unstable isotope?

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d