Answer: B. Human systems
Explanation:
Human systems in geography refers to the relationships that humans have between themselves and the environment. They include things like political boundaries, governance, citizen welfare and trade.
Migration and Interdependence refer to how humans move from one place to another and how they depend on each other for survival. This falls under human systems as it describes humans and their movements with each other to settle in other areas and mix with other humans where in coexisting, they will be interdependent on the other.
A primary pollutant is an air pollutant emitted directly from a source.
A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
Examples of a secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight; NO2, which is formed as NO combines with oxygen in the air; and <em><u>acid rain</u></em>, which is formed when sulfur dioxide or nitrogen oxides react with water.
Hope this helps:)
I’m pretty sure it’s called the tectonic plate theory
Let's solve your equation step-by-step.
2a−8a=12−8a
Step 1: Simplify both sides of the equation.
2a−8a=12−8a
2a+−8a=12+−8a
(2a+−8a)=−8a+12(Combine Like Terms)
−6a=−8a+12
−6a=−8a+12
Step 2: Add 8a to both sides.
−6a+8a=−8a+12+8a
2a=12
Step 3: Divide both sides by 2.
2a
2
=
12
2
a=6
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