Which of the following best describes a meteoroid?

(question 8 in image)

Piece of metal of rock and other material that present in the solar system.

Explanation:

Meteoroid is defined as small body present and moving in a solar system, if it is enters in the earth atmosphere then it is termed as meteors. When it enters in earth atmosphere it vaporizes and during this process flash of light appears in the sky which is known as shooting star.

If the meteor survives in an Earth atmosphere and reaches the surface than it is called as meteorite.

Hence the correct option is:

Piece of metal of rock and other material that present in the solar system.

the answer for sodium is 0.186

the answer for rubidium is 0.251

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.