What prevented explorers like Christopher Columbus from finding precise longitude?
A) Calculations necessary for determining longitude
B) The lack of accurate pendulums
C) A durable and precise clock
D) Longitude was not the issue, latitude was the problem
C
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Which of the following lists the CORRECT sequence of gases, from most to least concentration, in terms of percentage within the homosphere?
A) Oxygen, nitrogen, neon, hydrocarbons, carbon dioxide B) Nitrogen, oxygen, argon, carbon dioxide, trace gases C) Oxygen, ozone, nitrogen, PAN, carbon dioxide D) Nitrogen, argon, oxygen, xenon, carbon dioxide
Given that gneiss is commonly composed of quartz, feldspar, and mica, what igneous rock is a possible protolith for gneiss?
A. Schist B. Basalt C. Granite D. Gabbro E. Shale
The population of South Asia
A) could soon surpass East Asia to become the world's most populous region B) lags well behind both East Asia and Europe C) has already passed East Asia to become the world's most populous region D) is largely concentrated in two countries: Bangladesh and Pakistan E) has been slowly decreasing in recent decades
What percentage of China's major cities are already facing water shortages?
A. 5% B. 15% C. 33% D. 67% E. 100%