An increase in the value of one currency in terms of another. Currencies appreciate against each other for various reasons, including capital inflows and the state of a country's current account.
Read Powellâs account of the first ever river expedition through the Grand Canyon in The Exploration of the Colorado River and Its Canyons, issued as a Penguin Classic in 2003.
Alerts In Effect. Geologic Formations. The Grand Canyon of the Colorado River is a world-renowned showplace of geology. Geologic studies in the park began with the work of Newberry in 1858, and continue today. The Grand Canyonâs excellent display of layered rock is invaluable in unraveling the regionâs geologic history.