What Observational Evidence Supports the Galactic Fountain Model (Which Describes

question 32

Multiple Choice

What observational evidence supports the galactic fountain model (which describes how gas cycles between the disk of the galaxy and regions high above the disk) ?

• A)We have discovered a jet of ionized gas shooting out of the bulge of our galaxy.
• B)We have discovered that the entire galactic disk is being uniformly "rained on" by cool gas coming from the halo.
• C)We see hot gas high above the region of the disk near our solar system,along with cool gas that appears to be raining down from the halo.
• D)We have observed a lot of water molecules in the interstellar medium.

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Definitions:

Variable Cost

Expenses in a business that change in proportion with the volume of production or sales, such as materials and labor costs.

Total Cost

Total Cost is the complete cost of production, including both fixed and variable costs.

Average Fixed Cost

The total fixed costs of production divided by the quantity of output produced, showing how fixed costs per unit change with output levels.

Marginal Cost

The cost of producing one additional unit of a good or service, considering the variable costs involved.