Dr. Chang is studying seismic waves. He notices that seismic waves (a type known as P-waves) travel faster through the mantle than through the outer core. What can he conclude from this observation? A. The inner core is wider than the mantle. B. The mantle is wider than the inner core. C. The outer core is not as dense as the mantle. D. The mantle is not as dense as the outer core.

Differences between compact bone and cartilage

The diagram below represents a marine food web and a process that can harm the human population. each circle represents an organism and the smaller dots inside them represent a toxic substance. what is being represented and how does it harm the population? the diagram represents biological half-life, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents biomagnification, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents the process by which different organisms prey upon each other; this can impact the human population by reducing the number of organisms that do not contain the toxin. the diagram represents the way that toxins are metabolized by living organisms, with those at greater trophic levels able to metabolize more efficiently than those at lower levels. this means that those at higher tropic levels are safer for humans to consume compared to the organisms at lower trophic levels.

Are the earth's ocean floor and continents the same age geologically? why or why not?