What does this mean

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

The graph shows one consequence of urban sprawl. how did urban sprawl contribute to the change in biodiversity