How has new technology changed fossil fuel production? Select all that apply.
-Fracking now enables more oil to be pumped from existing oil wells.
-New fossil fuels can now be produced without containing any carbon.
-The amount of fossil fuel reserves beneath Earth's surface can now be increased.
-Areas that previously yielded little oil can now produce more.

Answer is in the file below

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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.

there is none because earth is stationary and flat.