What natural disaster buried an entire town in ash?
a. the volcanic eruptions of mt. vesuvius
b. the galveston hurricane
c. the san francisco earthquake
d. the japanese tsunami

european union policies. the eu's long-term objective is to achieve levels of air quality that do not result in unacceptable impacts on, and risks to, human health and the environment. eu policies aim to reduce exposure to air pollution by reducing emissions and setting limits and target values for air quality.

the main environmental problems in western europe were: energy production/acid rain, nuclear power/waste, air pollution/climate, heavy metals, pesticides, water pollution, solid waste, and unforeseen accidents. many environmental problems are common to most european countries.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom