Gold

Gold is a chemical element with symbol Au (from Latin: aurum) and atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable and ductile metal. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements, and is solid under standard conditions. The metal therefore occurs often in free elemental (native) form, as nuggets or grains, in rocks, in veins and in alluvial deposits. It occurs in a solid solution series with the native element silver (as electrum) and also naturally alloyed with copper and palladium. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides).

Gold's atomic number of 79 makes it one of the higher atomic number elements that occur naturally in the universe. It is thought to have been produced in supernova nucleosynthesis from the collision of two neutron stars and to have been present in the dust from which the Solar System formed. Because the Earth was molten when it was just formed, almost all of the gold present in the early Earth probably sank into the planetary core. Therefore, most of the gold that is present today in the Earth's crust and mantle is thought to have been delivered to Earth later, by asteroid impacts during the late heavy bombardment, about 4 billion years ago.

Calochortus luteus

Calochortus luteus, or Yellow mariposa lily, is a mariposa lily endemic to California.

Description

The primarily bright deep yellow flower is 3-5cm across and perianth bulb-shaped, lined red-brown inside, often also with central red-brown blotch and sparse hair inside.

Distribution

This species is found on coastal prairie, grasslands and some open forest floors. Its range is along the coastal ranges from region to the northern Santa Barbara County Channel Islands and mainland, Northwestern California, the Sacramento Valley, and the Sierra Nevada foothills from there to the Tehachapi Mountains.

Cultivation

Calochortus luteus is used in landscape design, with "non-habitat sourced" bulbs available from native plant nurseries and societies, to grow as an ornamental plant in gardens and for restoration projects.Plants for a FutureCalochortus luteus

References

External links

Media related to Calochortus luteus at Wikimedia Commons

Dry Creek

Dry Creek may refer to:

Communities

Watercourses

Australia

United States

This TV

This TV (also known as "This TV Network" or "this", and alternately stylized as "thisTV" with company name, ThisTv, LLC) is an American digital broadcast television network that is operated as a joint venture between the Tribune Broadcasting subsidiary of Tribune Media, and MGM Domestic Television Distribution LLC of the Metro-Goldwyn-Mayer group. This TV maintains a large programming emphasis on movies, but also airs other limited general entertainment content in the form of classic television series and children's programming.

The network is available in many media markets via broadcast television stations, primarily on their digital subchannels, and on select cable providers through carriage of a local affiliate (primarily on digital tiers). This TV broadcasts 24 hours a day in 480i standard definition. This TV's programming and business operations are headquartered at the Tribune Tower in Chicago; MGM handles advertising sales for the network through its offices in New York City.

List of diamond mines

There are a limited number of commercially viable diamond mines currently operating in the world, with the 50 largest mines accounting for approximately 90% of global supply. Diamonds are also mined alluvially over disperse areas, where diamonds have been eroded out of the ground, deposited, and concentrated by water or weather action. There is also at least one example of a heritage diamond mine (Crater of Diamonds State Park).

Africa

Angola

Botswana

South Africa

Others

Asia

Russia