aridity
51Nile River — Arabic Baḥr al Nīl River, eastern and northern Africa. The longest river in the world, it is about 4,132 mi (6,650 km) long from its remotest headstream and 3,473 mi (5,588 km) from Lake Victoria to the Mediterranean Sea. It flows generally north …
52Pleistocene Epoch — Earlier and longer of the two epochs that constitute the Quaternary Period. The Pleistocene began с 1.8 million years ago and ended с 10,000 years ago. It was preceded by the Pliocene Epoch of the Tertiary Period and followed by the Holocene… …
53Triassic Period — Interval of geologic time, с 248–206 million years ago, that marks the beginning of the Mesozoic Era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms… …
54sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …
55North American Desert — ▪ region, North America Introduction vast, irregular belt of inhospitable terrain (desert) that stretches north to south down the western side of the North American continent from southern Oregon and Idaho to northern Mexico. It roughly… …
56Chad Basin — The Chad Basin, also known as the Lake Chad Basin, is a large lowland area in north central Africa. In all directions from the center of this area the elevation changes are gentle. The Chad Basin is an endorheic (closed) basin its water does not… …
57Desiccation tolerance — refers to the ability of an organism to withstand or endure extreme dryness, or drought like conditions. Plants and animals living in arid or periodically arid environments such as temporary streams or ponds may face the challenge of desiccation …
58dryness — I (New American Roget s College Thesaurus) Lack of moisture Nouns 1. dryness, aridity, aridness; desiccation, dehydration, anhydration, dehumidification; thirst; drainage; curing, mummification, freeze drying (see preservation); evaporation. 2.… …
59aridness — noun a deficiency of moisture (especially when resulting from a permanent absence of rainfall) • Syn: ↑aridity, ↑thirstiness • Derivationally related forms: ↑thirsty (for: ↑thirstiness), ↑arid, ↑arid …
60thirstiness — noun 1. a physiological need to drink • Syn: ↑thirst • Derivationally related forms: ↑thirsty, ↑thirsty (for: ↑thirst), ↑thirst (for: ↑ …
