The most common way to become infected with giardia is after swallowing contaminated water. Giardia parasites are found in lakes, ponds, rivers and streams worldwide, as well as in municipal water supplies, wells, cisterns, swimming pools, water parks and spas.
Andreas Cellarius's illustration of the Copernican system, from the Harmonia Macrocosmica (1708). Heliocentrism, or heliocentricism, is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System. The word comes from the Greek (á¼¥Î»Î¹Î¿Ï helios sun and ÎºÎ­Î½ÏÏÎ¿Î½ kentron center).
Heliocentric and geocentric are two explanations of the configuration of the universe, including the solar system. The geocentric model says that the earth is at the center of the cosmos, and the planets, the sun and the moon, and the stars circles around it.The early heliocentric models consider the sun as the center, and the planets revolve around the sun.More about Geocentric. The most predominant theory of the structure of the universe in the ancient world was the geocentric model.he early heliocentric models consider the sun as the center, and the planets revolve around the sun. More about Geocentric. The most predominant theory of the structure of the universe in the ancient world was the geocentric model.