9 facts about the atmosphere

#1. Earth Has Had Three Atmospheres.

#2. Oxygen Caused the First Major Extinction

#3. The Sky Should Be Violet

#4. The Atmosphere Extends 6,200 Miles into Space

#5. It Protects Us from Meteors

#6. There are five layers within the atmosphere

#7. The atmosphere surrounds the planet, protecting it by absorbing the ultraviolet radiation from the sun, and regulating the temperature extremes that would otherwise occur between day and night.

#8. The troposphere lies closest to the Earth and is about 11 miles thick

#9. Blood Boils After 60,000 Feet into the atmoshpere

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.