What must occur for air masses to form fronts?

they must increase in strength.
they must collide with each other.
they must move from west to east.
they must create air-pressure differences.

In what climate does shifting cultivation predominate? and, what are its two characteristics?

Directions conduct research to collect information and data in order to write a well-informed argument essay responding to the following prompt: do you believe your local power company is doing enough to reduce dependence on nonrenewable energy sources? why or why not? remember that your argument essay should contain: a claim supporting evidence connected to your claim an acknowledgement of counterclaim(s) a conclusion after writing your rough draft, reread it and edit it for spelling, grammar, and clarity.

Ineed , i need to create a power point in life science here is a picture explaining a little what the topic is about, me with some information for my slides : (