Earth's Moon is a small ball of gray rock revolving 239,000 miles around Earth. It is just one of many in the solar system. The Moon has no air and no water. It is about one-fourth as large as…
by David Johnson A cosmopolitan city-state at the tip of the Malay Peninsula, Singapore has a mixed population of Chinese, Indians, Malays, and some Europeans. Each ethnic group has its…
IS PLUTO REALLY A PLANET? WHAT IS THE KUIPER BELT? FIND OUT MOREThis deep-frozen world of rock and ice was the last planet to be discovered—US astronomer Clyde Tombaugh spotted it in 1930. It is…
The following table lists the rank, title, and artist for each of the top ten selling digital songs in the United States during 2011. This list combines all available versions of the song…
What Have I Gotten Myself Into?ChemistryWhy Study Chemistry?Why Do We Need Chemistry?What Have I Gotten Myself Into?This Stuff Is Really Fun!Who Invented Chemistry?Succeeding Where Others Have Failed…
Mongan, Marie
(Encyclopedia) Mongan, Marie, 1933-2019, American natural childbirth advocate, b. San Diego, Ca., as Marie Madeline Flanagan, Plymouth State Univ. (B…
(Encyclopedia) rain tree, also called monkeypod, a large leguminous tropical tree (Albizia saman or Samanea saman) of tropical America belonging to the family Leguminosae (pulse family), the leaves…
(Encyclopedia) sea lily, stalked echinoderm of the class Crinoidea. Sea lilies are ancient, having reached their peak in the Middle Mississippian period; about 5,000 fossil species are known. About…
(Encyclopedia) sea pen, long, slender colonial organism of the same phylum as the jellyfish. Sea pen colonies are formed by several genera of the order Pennatulacea. The colony consists of a stalk…
(Encyclopedia) SevanSevansyĭvänˈ [key], lake, c.540 sq mi (1,400 sq km), NE Armenia, at an altitude of 6,280 ft (1,914 m); it is 324 ft (99 m) deep. The largest lake of the Caucasus, it is fed by…
