Rare Earth Elements, including cerium and yttrium and others.

Rare Earth Elements. Elements with atomic numbers 57 (Lanthanum) to 71 (Lutetium) inclusive plus scandium and yttrium.

Rare earth element, or rare earth, elements like cesium, lanthanum, etc.

Research, education and economics (a mission area within USDA).

Register of Educational Establishments

Research, Education and Economics mission area of USDA.

To riddle; to sift; to separate or throw off.

Resting energy expenditure. the amount of energy required to maintain basic body functions

Resting energy expenditure. the energy required to drive all physiological processes while in a state of rest.

See Rei.