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President Lincoln and Soldier's Home National Monument

(Encyclopedia)President Lincoln and Soldier's Home National Monument: see National Parks and Monuments (table)national parks and monuments (table). ...

President William Jefferson Clinton Birthplace Home National Historic Site

(Encyclopedia)President William Jefferson Clinton Birthplace Home National Historic Site: see National Parks and Monuments (table)national parks and monuments (table). ...

Salt River Bay National Historical Park and Ecological Preserve

(Encyclopedia)Salt River Bay National Historical Park and Ecological Preserve: see National Parks and Monuments (table)national parks and monuments (table). ...

Cane River Creole National Historical Park and Heritage Area

(Encyclopedia)Cane River Creole National Historical Park and Heritage Area: see National Parks and Monuments (table)national parks and monuments (table). ...

lanthanum

(Encyclopedia)lanthanum lănˈthənəm [key] [Gr.,=to lie hidden], metallic chemical element; symbol La; at. no. 57; at. wt. 138.90547; m.p. about 920℃; b.p. about 3,460℃; sp. gr. 6.19 at 25℃; valence +3. Lan...

argon

(Encyclopedia)argon ärˈgŏn [key] [Gr.,=inert], gaseous chemical element; symbol Ar; at. no. 18; at. wt. 39.948; m.p. −189.2℃; b.p. −185.7℃; density 1.784 grams per liter at STP; valence 0. Argon is a col...

rubidium

(Encyclopedia)rubidium ro͞obĭdˈēəm [key], metallic chemical element; symbol Rb; at. no. 37; at. wt. 85.4678; m.p. 38.89℃; b.p. 686℃; sp. gr. 1.53 at 20℃; valence +1. Rubidium is a very soft silver-white ...

promethium

(Encyclopedia)promethium prōmēˈthēəm [key], artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042℃; b.p. 3,000℃ (estimated); sp. gr. unk...

Rosie the Riveter World War II Home Front National Historical Park

(Encyclopedia)Rosie the Riveter World War II Home Front National Historical Park: see National Parks and Monuments (table)national parks and monuments (table). ...

earth, in chemistry

(Encyclopedia)earth, in chemistry, metallic oxide not readily reducible by chemical means, e.g., alkaline earths, rare earths, and alumina. The name is also applied to certain absorbent clays, e.g., fuller's earth,...