*Question*: Which best describes transportation technology? OPTIONS:
- a system that is used to move people and products
- an enterprise that changes raw materials into goods
- the building and finishing of structures
- the conversion of mechanical energy into heat energy
*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? OPTIONS:
- A logging company deforested millions of acres in South America.
- A major earthquake and tsunami changed the path of the Gulf Stream.
- A major volcanic eruption released ash and sulfur gas into the atmosphere.
- An increase in the use of automobiles released more carbon dioxide into the atmosphere.
*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 OPTIONS:
- collect relevant evidence
- tell people about the data
- publish results from the investigation
- discuss the investigation with other scientists
*Answer*:
collect relevant evidence