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Letter Term Description Category
M Mongolia

Country in East Asia.

Geography
M Magma

Extremely hot liquid and semi-liquid rock located under Earth's surface; when magma flows onto Earth's surface, it is called lava.

Geography
M Mode

The number which appears most often in a set of numbers.

Physics
M Menstrual Cycle (a)

A series of natural changes in hormone production and in the structures of the uterus and ovaries.

Biology
M Melting Point

The temperature where a solid turns to a liquid.

Physics
M Monaghan

County in Ireland.

Geography
M Madagascar

Country off the southeastern coast of Africa.

Geography
N Number (a)

Number (a)

Mathematics
N Natural Selection (Fingerspelling)

A mechanism of evolution where differences in phenotype impact survival and reproduction rates.

Biology
N Nucleotide

The basic building block of nucleic acids. RNA and DNA are polymers made of long chains of nucleotides.

Molecular Biology