The diagram shows a heating curve for a substance.
Which segment shows the substance changing from a gas
to a liquid?
Heating Curve of a Substance
O X-Y
Y-X
W-X
X-W
Temperature (Cº)
Heat Added (3)
Submit
Save and Exit
Mark this and return

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)