Why do scientists study seismographs? o to learn about different rock samples
o to determine the location of an epicenter
o to analyze mineral content from Earth’s crust
o to observe temperature changes on Earth’s surface

Explanation:

When there is an earthquake, everything in the seismograph moves except the weight with the pen on it. ..This record made by the seismograph is called a seismogram. By studying the seismogram, the seismologist can tell how far away the earthquake was and how strong it was.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs