As you look left to right:

-Monochromatic (Hue Shift)

-Analogous - Similar/adjacent colors on the color wheel (in this case blue and green)

-Triad - (Colors from three, equidistant spokes on the color wheel)

-Complementary colors - Colors opposite each-other on the color wheel

-Split complementary - The two colors on either side of the complementary color ( in this case blue, yellow-orange & red-orange)

-Double complementary - Two pairs of colors opposite on the color wheel ( in this case blue and orange, yellow and violet)