Oasis

Oasis: a fertile place in the desert, where water lies near or on the surface.

Official reserves

The stock of gold and foreign currency held by a country to finance any calls that may be made for the settlement of a foreign debt.

Okhotsk Sea

The Okhotsk Sea is the no. 11th contiguous open water surface on earth. It has a huge, 613,8 square mile (1,589,700 square km) area and 2,749 square feet (838 square meters) average depth. The Okhotsk Sea’s greatest known depth is 12,001 feet (3,658 meters), which can be found at 146 10 E.

Olduvai gorge

A site of fossil beds in northern Tanzania, containing the most continuous known record of humanity over the past 2 million years, including fossils from 65 hominids.

Oligarchy

A government-run by a few persons or a small group.

Oman

Location: Southwest Asia Official name: Sultanate of Oman Formation (date of independence / date current borders were established): 1951 / 1951 Capital city: Muscat Population: 2.9 million / 35 people per sq mile (14 people per sq km) Total land area: 82,031 square miles (212,460 square km) Language(s) spoken: Arabic (official language), Baluchi, Farsi, Hindi, … Read more

Opec

The organization of petroleum exporting countries was established in 1960 by some oil-producing nations to coordinate policies on selling petroleum products.

Open borders

Political boundaries that have a minimal political or structural impediment to easy crossing between two countries.

Ore

Ore: a mineral or rock from which a valuable metal, such as iron, gold, or copper, can be mined or extracted.