Radiometric dating shows that the oldest ocean crust is ____________________ years old, and the oldest continental crust is ____________________ years old.
Fill in the blank(s) with the appropriate word(s).
180 million, 3.96 billion
Environmental & Atmospheric Sciences
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In 2010 India's total GDP was __________ in the world.
A. Fifth B. Fourth C. Second D. Sixth
Environmental & Atmospheric Sciences
Why is iridium a good indicator of impacts by extraterrestrial bodies?
What will be an ideal response?
Environmental & Atmospheric Sciences
In what form(s) will a carboxylic acid, RCOOH, be present if the pH of an aqueous solution is adjusted to be very much lower than the pKa of the acid?
A) primarily as RCOOH (aq) B) primarily as RCOO- (aq) C) equal amounts of a and b D) neither a nor b
Environmental & Atmospheric Sciences
A solution is prepared by dissolving 3.50 grams of NH4Cl in enough water to make 250. mL of solution. What is the concentration of this solution?
A) 0.0327 M B) 0.0654 M C) 0.131 M D) 0.262 M
Environmental & Atmospheric Sciences