If you shout into the grand canyon, your voice travels at a speed of 340 m/s to the bottom of the canyon and back, and you hear an echo. how deep is the grand canyon at the spot where you hear an echo 5.2 seconds after?

positive reinforcement? ?

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods