Some types of leg pain can be traced to problems in your lower spine. Leg pain can also be caused by blood clots, varicose veins or poor circulation. Some common causes of leg pain include: 1  Achilles tendinitis. 2  Achilles tendon rupture. 3  ACL injury. 4  Baker's cyst. 5  Bone cancer. 6  Broken leg. 7  Bursitis.
The Earth's Atmosphere. The atmosphere surrounds Earth and protects us by blocking out dangerous rays from the sun. The atmosphere is a mixture of gases that becomes thinner until it gradually reaches space. It is composed of Nitrogen (78%), Oxygen (21%), and other gases (1%).
The Atmosphere of Europa. A satellite which has an atmosphere, such as Jupiter's moon Io, and which also is inside a magnetosphere (unlike the Earth's moon), will leave a cloud of particles behind as it orbits the planet.zone is an important constituent of the Earth s atmosphere. Even though Ganymede and Callisto have thin atmospheres, there does not seem to be a Ganymede or Callisto torus, the way there is at Europa and Io. Last modified September 19, 2003 by Jennifer Bergman.