Question

1. which process contributes to the formation of fossil fuels over millions of years?

volcanic activity
photosynthesis
weathering and erosion
decomposition of organic matter

Explanation:

Fossil fuels like coal, oil, and natural gas are formed from the remains of ancient plants and animals. Over millions of years, these organic materials are buried under sediment and subjected to heat and pressure. The decomposition of this organic matter under these conditions leads to the formation of fossil fuels. Volcanic activity mainly relates to magma and volcanic landforms. Photosynthesis is the process by which plants convert light energy into chemical energy (not directly related to fossil - fuel formation in the long - term geological sense here). Weathering and erosion are processes that break down rocks and transport sediments, not directly involved in the formation of fossil fuels from organic matter.

Answer:

decomposition of organic matter