List at least three pieces of information you would need when attempting to radiometrically date an igneous rock using
uranium-238/lead-206 isotopes. What will be an ideal response?
1. Mass of your sample
2. Mass of parent isotope: uranium-238
3. Mass of daughter isotope: lead-206
4. Condition of sample: Has it been exposed to weathering, metamorphism, etc.?
5. Half-life of uranium-238
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Ozone, a gaseous O3 molecule that filters out harmful UV radiation, is found in the
a. Troposphere b. Geosphere c. Hydrosphere d. Stratosphere e. Biosphere
Which of the following is the net ionic equation for the reaction of the weak acid HC2H3O2 with the weak base NH3?
A) HC2H3O2(aq) + NH3(aq) ? NH4C2H3O2(aq) B) HC2H3O2(aq) + NH3(aq) ? C2H3O2-(aq) + NH4+(aq) C) H3O+(aq) + NH3(aq) ? NH4OH(aq) D) H3O+(aq) + C2H3O2-(aq) + NH3(aq) ? NH4+(aq) + C2H3O2-(aq) + H2O(l)
Subsistence agriculture includes all of the following categories EXCEPT
A) shifting cultivation. B) pastoral nomadism. C) peasant-based agriculture. D) intensive subsistence agriculture wet rice dominant. E) mixed crop and livestock.
What is riparian vegetation, and why is it important to life in the desert biome?
What will be an ideal response?