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Radioactive carbon-14 is often useful in determining the absolute age of geologic samples because radioactive isotopes
3 p.m.
watershed
highest in tube A
3
Mastodont
2 half-lives
decay at a regular rate
deepest at Y
How many half-lives have passed if a sample contains 25% of its original carbon-14?
3 p.m.
watershed
highest in tube A
3
Mastodont
2 half-lives
decay at a regular rate
deepest at Y
The age of which index fossil could be determined by using carbon-14?
3 p.m.
watershed
highest in tube A
3
Mastodont
2 half-lives
decay at a regular rate
deepest at Y
Which bar graph would best represent the rate of water infiltration through tubes A, B, and C?
3 p.m.
watershed
highest in tube A
3
Mastodont
2 half-lives
decay at a regular rate
deepest at Y
The area of land drained by this river and its tributaries is best described as the river’s
3 p.m.
watershed
highest in tube A
3
Mastodont
2 half-lives
decay at a regular rate
deepest at Y
What is the approximate time of day when the Sun is at position C?
3 p.m.
watershed
highest in tube A
3
Mastodont
2 half-lives
decay at a regular rate
deepest at Y
These tubes are placed in water up to the level of line XY to demonstrate capillarity. After one hour, the height of the water above line XY will be
3 p.m.
watershed
highest in tube A
3
Mastodont
2 half-lives
decay at a regular rate
deepest at Y
Which cross section best represents the profile of the bottom of the river between points X and Y at location A?
3 p.m.
watershed
highest in tube A
3
Mastodont
2 half-lives
decay at a regular rate
deepest at Y
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