How do earthquake (seismic) waves allow scientists to determine the composition of Earth layers? Question 20 options:

A The waves are blocked, showing the layers are solids.

B The waves are shortened, showing the layers are made of the same material.

C The waves are lengthened, showing that the mantle is made of water and salt.

D The waves are traveling at different speeds, some bend or refract, the shadow zone doesn't record any s waves, showing the layers have different compositions.

Which of the following is true about fossils? a. the relative age of fossils cannot be determined from their position in sedimentary layers. b. fossils found in lower layers of sedimentary rock are as old as fossils found in upper layers of sedimentary rock. c. fossils found in upper layers of sedimentary rock are older than fossils found in lower layers of sedimentary rock. d. fossils found in lower layers of sedimentary rock are older than fossils found in upper layers of sedimentary rock.

The vedas were a collection of aryan religious writings t or f

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called