Question

1. why are fossil fuels classified as nonrenewable resources?

they are classified as nonrenewable because they are very difficult to extract.
they are classified as nonrenewable because they provide all the energy we use.
they are classified as nonrenewable because they are very scarce on earth.
they are nonrenewable because they take hundreds of thousands of years to form.

Explanation:

Nonrenewable resources are defined as resources that form at a rate far slower than humans consume them. Fossil fuels form from ancient organic matter over geological timescales (hundreds of thousands to millions of years), so they cannot be replenished within a human lifespan to match consumption. The other options are incorrect: extraction difficulty, total energy provision, and current scarcity do not define nonrenewability.

Answer:

They are nonrenewable because they take hundreds of thousands of years to form.