*Question*: Which best describes transportation technology?
*Answer*: a system that is used to move people and products

*Question*: In 1783, Europe was unusually cold and foggy. The rain was acidic. Which event most likely caused the unusual climate in Europe that year?
*Answer*: A major volcanic eruption released ash and sulfur gas into the atmosphere.

*Question*: Scientists conduct investigations to answer questions. Before making a valid conclusion, scientists must
*Answer*:
collect relevant evidence