Precautions of natural disasters like landslides and earthquake

What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

What did the pattern of earthquakes in the wadati-benioff seafloor zones show scientists? a.) earthquakes occur where the ocean floor reaches its highest temperatures. b.) many earthquakes take place 700 kilometers below the seafloor. c.) slabs of ocean floor return to the mantle in subduction zones. d.) ocean - trenches cause earthquakes.