Its basically saying something (object) at rest is going to stay there until something moves it like an outside object.
Answer:
B. Theory
Explanation:
A theory can be changed as new information is discovered.
Microorganisms such as bacteria can be removed by disinfection. Certauns substances called biocides are addes to water to make it pure. Purification can also be done by UV-light .
Answer:
B
Explanation:
The Earth is tilted 23.5 degrees on its vertical axis. During the northern hemisphere's spring and summer, the northern hemisphere is tilted towards the Sun.
