What is the best definition of leachate? 

A)  water contaminated by hazardous waste 
B)  rainwater contaminated as it percolates through solid waste 
C)  mixture of methane and CO₂ released from landfills 
D)  hazardous waste stored in a lake

Leachate

Liquid that has percolated through a solid and leached out some of its constituents, often used in the context of water passing through waste material in landfills.

Contaminated Water

Water that has been polluted by chemical substances, bacteria, or other pathogens, making it unsafe for human consumption and use.

Percolates

The movement of water or other liquids through a porous medium, often referring to the process of water filtering through soil layers.