After chlorofluorocarbons were banned, which class of chemicals was used in their place? A. Carbon dioxide
B. Hydrofluorocarbons
C. Methane
D. Sulfur dioxide

How many square miles is the big island of hawaii

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle

Which two following best identify the central themes of this speech in the passage the man in the arena