cenozoic era
51Geology of West Virginia — Prior to one billion years ago, the geologic history of West Virginia is obscure. The oldest evidences of life found in West Virginia occur in rocks about 600 million years old, in the Antietam Formation of Lower Cambrian age. The oldest exposed… …
52Africa — /af ri keuh/, n. 1. a continent S of Europe and between the Atlantic and Indian oceans. 551,000,000; ab. 11,700,000 sq. mi. (30,303,000 sq. km). adj. 2. African. * * * I Second largest continent on Earth. It is bounded by the Mediterranean Sea,… …
53Caribbean Sea — a part of the Atlantic Ocean bounded by Central America, the West Indies, and South America. ab. 750,000 sq. mi. (1,943,000 sq. km); greatest known depth 22,788 ft. (6946 m). Also called Caribbean. * * * Arm of the Atlantic Ocean. It covers about …
54tropical rainforest — Introduction also spelled tropical rain forest luxuriant forest, generally composed of broad leaved trees and found in wet tropical uplands and lowlands around the Equator. Rainforests are vegetation types dominated by broad leaved trees …
55Western Africa — ▪ region, Africa Introduction region lying south of the Sahara and east and north of the Atlantic Ocean. It is latitudinally divided into two parallel belts of land: the western portion of the Sudan, a geographic area that stretches across… …
56Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …
57Sierra de Guadarrama — Sub Range Peaks of La Pedriza …
58Cambrian — For other uses, see Cambrian (disambiguation). Cambrian Period 542–488.3 million years ago …
59Ordovician — Period 488.3–443.7 million years ago …
60Appalachian Mountains — Appalachian redirects here. For the region, see Appalachia. Appalachian Mountains Appalachians Range …
