Okay, students, look at this image: this is a great way of learning the ELEMENTAL NATURE of each sign and "who's on which team."
Red Fire signs, ready for action (from L-R, counter-clockwise):
Aries, Leo, Sagittarius
Green Down-to-earth signs, ready to be steady: Taurus, Virgo, Capricorn
White Lighter-than-Air signs, and away we go: Gemini, Libra, Aquarius
Blue Ocean-deep emotional water/"Tears 4 Fears" signs: Cancer, Scorpio, Pisces
Red & White; that's alright (Fire & Air)
Green & Blue; works for you (Earth & Water)