Explain why toxic chemicals are classified as Hazard​

The reason why toxic chemicals are classified as hazard because they can do as much damage as hazard things and can cause a serious of problems to one's health, for something to be hazard it can be flammable, and toxic chemicals are just that.

Toxic materials can cause serious health effects in an exposed individual. The degree of hazard associated with any toxic material is related to the exact material you are exposed to, concentration of the material, the route into the body and the amount absorbed by the body (the dose).

Explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.