Chihuahua Dog Breed. First discovered in Mexico, the Chihuahua is best known for being the smallest dog breed in the world. Extremely loyal to its owner, the breed has recently become a popular culture icon in the United States, most notably Paris Hilton's Chihuahua, Tinkerbell. Physical Characteristics.
Earth formed around 4.54 billion years ago by accretion from the solar nebula. Volcanic outgassing probably created the primordial atmosphere and then the ocean; but the atmosphere contained almost no oxygen and so would have been toxic to most modern life including humans.
How did the ocean form? Formation of the OceanThe current theory holds that after the Sun formed, there was a very large disk of dust and gas orbiting it. In this disk were all the elements that we s â¦ ee today, which were themselves formed in the furnaces of other stars.