What is a front in weather?

A weather front is a transition zone between two different air masses at the Earth's surface. Each air mass has unique temperature and humidity characteristics. Often there is turbulence at a front, which is the borderline where two different air masses come together. The turbulence can cause clouds and storms.

Explanation:

A weather front is a boundary separating air masses of different characteristics such as air density, wind, and humidity

Explanation:

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.

question

which are human systems?

the amazon rain forest

the appalachian trail

the george washington bridge

the himalayas

the hoover dam

the north american free trade agreement