On a warm day in late October, the air temperature drops 20 degrees and a rare fall thunderstorm takes place. Which event is most likely happening with the changes in
weather?
O A warm front is moving through.
O An occluded front is present.
O A stationary front is present.
O A cold front is moving through.

Which barrier to economic development is shown in the following examples?

This is a 2017 topographic map of puerto rico in the united states, and i'm sorry that people there have suffered such a disaster. i want to ask, what do the yellow dots and areas represent on this graph? and the blue area and the little blue circle, and the little blue sign that looks like a signal tower, what do they stand for?

What is the name for the famous "ring" of volcanos? a. ring of flames b. ring of fire c. ring of lava d. ring of death