1. foamy wave (8 letters)
WHITECAP
2. big drop in body temperature (11 letters)
HYPOTHERMIA
3. small specialty shop (8 letters)
BOUTIQUE
4. disturbance (6 letters)
RUCKUS
5. essential force (9 letters)
LIFEBLOOD
6. what the Earth turns on (4 letters)
AXIS
7. guarantee (6 letters)
ENSURE