Why isn’t earth a closed system? a. it reflects and radiates energy b. matter continually cycles between the spheres c. large amounts of matter come to earth from space d. earthquakes, volcanoes, and hot springs release energy from earth’s interior

Earth is actually considered a closed system so this question is confusing.

C. Large amounts of matter come to earth from space

Explanation:

A closed system is a system where only energy is transferred to the surrounding. No matter will be transferred into the system or out of the system.

By that definition earth is not closed system. since large amount of matter from distant supernovas, asteroids etc. has been deposited on earth from the very beginning.

We mine Gold, uranium for our use which was deposited on earth by supernovas So all deposits of iron, aluminum etc. come from stars massive than our sun.

The amount of all these mineral deposits are pretty high, needless to mention the addition of mass by meteorites and the loss of mass by sending space crafts to space

So we can say earth is not a closed system

Note:

But for our current calculations we treat earth as a closed system since no mineral deposit is made on earth at the moment by supernova burst (life on earth will come to an end if that happens now). The loss of mass by sending objects into space and the addition of mass by meteorites are very negligible compared to the mass of earth. So for simplicity purpose we consider earth as a closed system

conduction, convection, radiation

1.   what is light?

light is an electromagnetic wave visible to the human eye. 

2. what is a reflection?

the rebounding of a light ray when it hits a mirror.

3. what is the incident ray?

contacts the surface of an object.

4. what is the reflected ray?

bounces off a reflective surface.

5. what is the normal ray?

perpendicular to the surface of a mirror.

6. what is the angle of incidence?

an angle formed by the incident ray and the normal.

7. what is the angle of reflection?

an angle formed by the reflected ray and the normal.

8. what is refraction?

(bending.)

9. what is a converging lens?

bring together light rays that pass through.

10. what is a diverging lens?

spreads out light passing through.

11. focal point?

the real point where the refracted rays meet when the incident rays run parallel.

i copy pasted btw from an website..