How do geologists locate the center of an earthquake? check all that apply.

they use seismic waves.
they compare worldwide data.
they collect data from seismographs.
they measure arrival times of surface waves.
they draw squares on maps for measurements.

    1,2,3

They use seismic waves.

They compare worldwide data.

They collect data from seismographs.

Explanation:

Options A (They use seismic waves), C (They collect data from seismographs) and D (They measure arrival times of surface waves) follow.

Explanation:

A sudden release of energy in the lithosphere of the earth that creates the seismic waves and results in the shaking of the Earth's surface is known as an earthquake.

Geologists during the occurrence of an Earthquake employs seismometers to find the source of the earthquake. Geologists can find out the epicentre of an earthquake by observing the seismograms from diverse recording locations. The difference in the time between the P- and S-waves notifies us about the distance the earthquake is from the seismograph. Therefore, by estimating the time interval at three stations we can find out where the epicentre is.

the industrial development of cities in the ruhr area in the nineteenth century is described. the research was based on english and german language sources. several factors that shaped growth and paths of the cities were categorized and analyzed. they are locations, resources, traditions, entrepreneurs, and technological developments. locations and resources were the most important among them; other factors may be regarded as consequences from locations and resources. among the cities, bochum, essen, gelsenkirchen, and dortmund had the richest resources and most favorable locations in the transportation network and grew to be the largest cities in the ruhr area near the end of the nineteenth century. riverside location was also a favorable factor for the development, as shown in the development of duisburg on the confluence of rhine and ruhr. resource distribution can explain the rise of textile industry, metallurgical industry, and coal and iron industries, and the northward progression of the mining industry. tradition was an important factor for cities such as krefeld, barmen, elberfeld, solingen, and remscheid, which experienced development based on their traditions through the nineteenth century. various entrepreneurs exerted influences within and beyond the local level over the ruhr area. technological development stimulated the northward progression of the mining industry and the deep connection between the coal and the iron industries.