Alvarez and his team hypothesized, and found evidence for, an asteroid impact that triggered a global extinction. Using this hypothesis, the scientific community explored other lines of evidence to support the theory including .

Past massive volcanic activity

Explanation:

This massive volcanic activity provides evidence that asteroid could have actually triggered a global extinction.

This is because scientists discovered a huge amount of surface area which they believe was altered by volcanic material.

Coal: Combustion reaction converts chemical energy into light and heat. Wood: Combustion reaction converts chemical energy into light and heat. Petroleum: Can be burned to release light and heat or changed into another form of chemical energy, such as gasoline.

Explanation: