The circle has two forms of equation - General Form and Standard Form. The general form of the equation of the circle would be x^2 + y^2 + Dx + Ey + F = 0. The constants of this equation are D , E and F. The way to use general form is to complete the square and then proceed the equation in standard form. In that way we can identify the radius and center of the given circle.
The correct answer is (B) They are both Northern Hemisphere, warm-temperate forests. Although Appalachian (U.S.A.) and Southwestern Caucasus (Russia) have common origins, both northern hemisphere warm-temperature Tertiary forests, they have developed differently. The similarities also include the species-to-genus, species-to-families ratios and the floristic composition.
Isostatic adjustment usually occur when there is a void to attain a stable equilibrium hence when the void is filled due to the isostatic adjustment hence soil erosion occur
I think it's B but I'm not to sure. hope that at least kinda helps.
