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www.reference.com/article/earth-43e8a25a6c575d7f

Earth formed around 4.54 billion years ago and is the third planet from the Sun. It is the fifth largest planet in the solar system and the largest of the terrestrial planets. It is also the densest of all the planets.

www.reference.com/article/block-unknown-calls-7e0acdfd47903a45

Depending on the phone's operating system, phone owners can block calls by installing apps that offer this service. Some phones, such as the Samsung Galaxy S5, also come with native call-blocking features that owners can use.

www.reference.com/article/unknown-france-4c29b4f4f52c6c3e

France's formal name is La Republique Francaise, which means "the French Republic." It is also called "The Hexagon" because of its six-sided shape. It is the largest country by size in Europe covering almost a fifth of the European Union's total area.

www.reference.com/article/identify-unknown-pill-fdac9765ed32d40c

WebMD, Drugs.com and Healthline all operate search engines to identify pills using by a combination of shape, color and imprint. Pills sold in the United States are legally required to be uniquely identifiable unless exempted, according to the U.S. Code of Federal Regulations.

www.reference.com/article/previously-unknown-sea-creatures-97700dcdc489af8d

Thousands of previously unknown sea creatures have been discovered in the last decade, including the dumbo octopus, the yeti crab, the blind lobster and the benthic comb jelly. Many of these bizarre species inhabit the deepest depths of the ocean.

www.reference.com/world-view/address-letter-unknown-person-e55ff5562b85bbab

There are several ways to address a letter to an unknown person, including: "Dear Sir or Madam," "To whom it may concern" or "Dear Sir." Not knowing the gender of the recipient of the letter makes "To whom it may concern" the most practical choice.

www.reference.com/article/interesting-earth-4dfa0b0f4c1cee81

The one and only known home for life, Earth is one of the most interesting planets of the solar system. Life on Earth is extremely diverse; however, relative to Earth's size, all of life is contained within a very thin layer of its surface and lower atmosphere.

www.reference.com/article/tomb-unknown-soldier-39bc9d74065d48f4

Located in the Arlington National Cemetery, the Tomb of the Unknown Soldier is a monument dedicated to American military service members who died in war without their remains being identified. The marble sarcophagus was originally put in place after World War I, according to the official website of

www.reference.com/article/tomb-unknown-soldier-400d1d9e1adaed32

The Tomb of the Unknown Soldier is actually a collection of tombs in Arlington National Cemetery. The tomb under that of the large white sarcophagus is the term of the first unknown soldier buried there in 1921. There are also tombs of another soldier from World War I, a World War II soldier, a Kore

www.lifehack.org/articles/communication/going-into-the-unknown.html

Going into the unknown is how you expand what is known. Chief of Product Management at Lifehack Read full profile Going into the unknown is how you expand what is known. Humans are creatures of habit. We love to establish a routine and stick with it. Then we often put ourselves on auto-pilot. Routin