the amount, level, or extent to which something happens or is present.

a disorder of structure or function in a human, animal, or plant, especially one that produces specific signs or symptoms or that affects a specific location and is not simply a direct result of physical injury.

group of languages that form the Sinitic branch of the Sino-Tibetan languages, spoken by the ethnic Han Chinese majority and many minority ethnic groups in Greater China.

Yangtze river system

amazon river system

Nile river system

Mississippi river system

relating to Norway or its people or language.

a unit of 3,000–6,000 men in the ancient Roman army.

an area or division, especially part of a country or the world having definable characteristics but not always fixed boundaries.

personal ornaments, such as necklaces, rings, or bracelets, that are typically made from or contain jewels and precious metal.

_{materials from the Earth that are used to support life and meet people's needs}

electricity produced from hydropower

a state of confused and noisy disturbance

a particular place or position.

a particular place or position.

^{a mountain range in the eastern United States extending from Quebec to the Gulf of Mexico; a historic barrier to the early westward expansion of the United States.}

^{a flat, elevated landform that rises sharply above the surrounding area on at least one side}

^{formed from hot molten material (magma) rising from the Earth's mantle into the crust that pushes overlying sedimentary rock layers upward to form a “dome” shape}