What is the cation exchange capacity (in meq/100 g) of a 200 g soil sample that contains the following amounts of exchangeable cations: 360 mg ca2+, 46 mg na+, 312 mg k+, and 216 mg mg2+?

use the following molar weights: ca2+ = 40.1 g/mol; na+ = 23.0 g/mol; k+ = 39.1 g/mol; mg2+ = 24.3 g/mol.

What is drought? what problem can cause?

Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of ( 1 ) the fossils tell us that polar regions ( 2 ) ( 1 ) a. carbonization b. mineralization c. trace fossils ( 2 ) a. had tropical plants that can grow in ice b. might have had a diffierent climate in the past c. will have abundent vegitation

Why did the united states lead a coalition to invade iraq in 1991? o a. there was a fundamentalist revolution in iraq. o b. iraq had invaded iran. o c. an oil embargo had started in the middle east, o d. iraq had invaded kuwait.