2. The diameter of Earth is 1.3 x 104 km. What is the diameter expressed in decimeters? Given
Unknown:
Solve:

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)