In what sense is the earth a closed system? A) Earth’s atmosphere prevents the transfer of energy or matter between Earth and space.
B) Earth’s atmosphere prevents the transfer of matter, but allows the transfer of energy between Earth and space.
C) Earth’s atmosphere absorbs all of the Sun’s energy, but allows only a part of it to reach the surface of Earth.
D) Earth’s atmosphere traps all of the Sun’s energy, thereby providing all living organisms the energy required to survive.

Lin yao looks at the back of a spoon. how should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.