37. Currently, rooftop solar panels produce only a fraction of the electricity used in the buildings on which they are installed. Which of the following strategies would best combat the problem of insufficient electricity generation from the rooftop solar panels? (A) Installing passive solar energy systems on all available, unshaded rooftop space and positioning them to face south
(B) Installing active solar energy systems on all available, shaded rooftop space and positioning them to face northeast
(C) Installing passive solar energy systems on all available, shaded rooftop space and positioning them to face northeast
(D) Installing active solar energy systems on all available, unshaded rooftop space and positioning them to face south

1) earth's crust is made up of relatively rigid plates that ride atop earth's hot, semiliquid mantle. (2) the plates are called tectonic because they're in constant motion. (3) they can move because earth's mantle is a very hot and semiliquid fluid called magma. (4) volcanoes are a result of magma rising up or erupting through a plate, particularly where plate boundaries are moving against each other. (5) also, when plates slide against each other, causing friction along adjacent plate boundaries, earthquakes frequently occur. (6) therefore, we often find volcanoes and earthquakes along plate boundaries. (7) plates may also collide. (8) when that happens, mountain ranges are formed. (9) for example, the collision of the plate carrying the indian subcontinent created the himalayan mountains when it collided with the asian plate. 2. which sentence in this passage introduces a new topic that might begin a new paragraph? a. sentence 5 b. sentence 4 c. sentence 7 d. sentence 6

With the use/abuse of alcohol, the heart is more efficient in the use of nutrients by the heart tissue.

Which soil horizon, also known as the zone of accumulation, is enriched in clay, iron oxides, silica, carbonate, and other materials?