One significant difference between an ionic bond, where electrons are taken from one atom and added to another atom, and a covalent or metallic bond, where electrons are shared, is ________
A) ionic bonds make a material more malleable than covalent and metallic bonds
B) ionic bonds are stronger than covalent or metallic bonds
C) ionic bonds produce ions but covalent and metallic bonds do not produce ions
D) ionic bonds do not result in the attraction of oppositely charged atoms, but covalent and metallic bonds do
C
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Cattle emit the greenhouse gas ________ through their digestive processes
Fill in the blank(s) with the appropriate word(s).
Air bubbles in the Antarctic ice sheet show that
A) carbon dioxide is relatively high during cold periods B) carbon dioxide is relatively low during cold periods C) carbon dioxide and temperature show no relationship D) the Industrial Revolution substantially increased air temperatures
Water in the spaces between soil, rock, and gravel is called ____.
A. groundwater B. embedded water C. virtual water D. a watershed E. a soil aquifer
The energy that powers the biosphere comes almost entirely from ________
A) soil nutrients. B) abiotic chemical reactions. C) endogenic processes. D) fluvial action. E) the Sun.