What is a blowout?

-a shallow depression caused by deflation
-a shallow depression caused by abrasion
-a stony surface layer caused by deflation
-a stony surface layer caused by abrasion

The layers of earth are based on what two sets of characteristics?

The great scientist alfred wegener proposed that continents have moved, while other scientists such as t.c.chamberlin argued against wegener. wegener's ideas eventually won, and are now widely accepted, because: a) wegener's ideas were more beautiful, and so were favored by the intellectual elite.b) wegener's ideas did a better job of predicting the results of new observations and experiments.c) wegener's ideas appealed to dead white european males, whereas chamberlin's didn't.d) wegener's ideas appalled dead white european males, and we all know that in this politically correct era,dead white european males cannot get a fair shake.e) wegener won the nobel prize.

Find the coordinates of a if b(-9,-10) is the midpoint of ac and c has the coordinates of (-1,9)