On the map of the united states shown below, four lines have been drawn and labeled a, b, c, and d

the length of which line best represents the distance from earth’s surface to the top of the mesosphere?
(1) a
(2) b
(3) c
(4) d

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

The creation of the trans-siberian railway allowed people to travel across russia. how could this railway impact russian culture?