Earthquakes are detected by which of the following?

richter scale

barometer

seismograph

global positioning system

Blank is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer

Where is the world’s shortest commercial runway?

The world wars of the twentieth century immediately led to a. the establishment of a communist bloc in eastern europe b. the urbanization of europe’s societies c. an emphasis on humanism d. an emphasis on ties to greek and roman societies select the best answer from the choices provided. a b c d