Although it has been largely phased out in most countries, the World Health Organization (WHO) supports the limited use of ____________________ to control the spread of malaria
Fill in the blanks with correct word
DDT
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Sedimentary rocks that are composed of rounded gravel-sized particles are classified as
conglomerates. Indicate whether the statement is true or false.
Which coastal marine ecosystem consists of at least 60 species of plants that grow underwater in shallow marine and estuarine areas along most continental coastlines?
A. salt marshes B. sea grass beds C. intertidal zones D. mangrove forests E. coral reefs
Where is the oldest layer in this tilted sequence of sedimentary rocks?
A. The darkest layers will be the oldest. B. At the top of the hill in the center of the photograph. C. The layers on the right of the photograph. D. The layers on the lower left part of the photograph.
Substances that can harm a human when eaten are called __________.
A) Toxic B) Explosive C) Reactive D) Corrosive