For a neutrally-charged atom to become a positively-charged atom of the same element, it must ____
A)lose a proton
B)lose an electron
C)gain a proton
D)gain a neutron
E)form a covalent bond
B
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Historically, frontiers rather than boundaries separated many states
Indicate whether the statement is true or false.
Robert Constanza and his colleagues have shown that ________
A) the value of ecosystem services is more than $48 trillion in 2013 dollars B) ecosystems services cannot be assigned monetary values because they are external C) ecosystem services are valued at less than 0.5% of the U.S. GDP D) nutrient cycling is the least valuable of ecosystem services E) NAFTA has had environmental benefits worth $2.7 billion in 2011
Which statement is true of an equinox?
a. The hours of daylight and darkness are exactly the same all over Earth. b. Daylight is longer than darkness over the Northern Hemisphere. c. Darkness is longer than daylight over the Northern Hemisphere. d. The hours of daylight and darkness in each hemisphere vary according to the local season.
Describe how the half-live of radioactive elements can be used to determine the age of rock through radiometric dating
What will be an ideal response?