Question

beat the heat: extreme heat
heat - related deaths are preventable
what:
extreme heat or heat waves occur when the temperature reaches extremely high levels or when the combination of heat and humidity causes the air to become oppressive.
who:
where:
how to avoid:
examine the \what\ section of the \beat the heat\ infographic. what does the evidence and details included in this section reveal about what happens to the air during extreme heat?
heat and humidity cause air to become lighter
heat and humidity cause air to be thinner
heat and humidity cause air to be more oppressive

Explanation:

The "What" section of the infographic explicitly states that "heat and humidity causes the air to become oppressive." Among the given options, "heat and humidity cause air to be more oppressive" directly aligns with this statement. The other options ("heat and humidity cause air to become lighter" and "heat and humidity cause air to be thinner") are not mentioned in the provided infographic content.

Answer:

heat and humidity cause air to be more oppressive