Which statement below BEST explains global warming? B. an increase in the concentration of ozone
C. a decrease in the amount of deforestation
A. an increase in Earth's average surface temperature
D. an increase in the temperature of the oceans

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.