The correct answer is seismic waves.
The middle layer of the Earth’s is called mantle. Mantle is dense and hot layer composed of silicate minerals. In the base of mantle secondary earthquakes disappear.
Seismic tomography is used for the imaging of this layer. It is an imaging technique that uses seismic waves generated by earthquakes to create images of Earth’s structure.
Mm i think it’s concrete bc ik it’s a material that can withstand a flood
The correct answer is:
There is no ASSOCIATION between fluoride exposure and increased cancer risk in humans.
Answer choice A.
I am not that good, but maybe the digestive system