The diagram shows circles drawn by geologists trying to determine the location of an earthquake’s epicenter. Map of the United notes. Three circles centered at Portland, Salt Lake City, and Los Angeles. The circles converge at San Francisco. What does each star on the map represent? location of an epicenter location of a focus location of a seismograph location of a wave.

Layer r contains a well-known index fossil that is 100 million years old. based on this information and the principle of superposition, a. layers t and m are older than 100 million years, and layers x and g are younger than 100 million years. b. layers t, m, x, and g are all older than 100 million years. c. layers t and m are younger than 100 million years, and layers x and g are older than 100 million years.