Most of the basalt and gabbro on the ocean floor is created at mid oceanic ridges, which are also ________.
A. divergent plate boundaries
B. ocean-ocean convergent plate boundaries
C. intraplate igneous areas
D. ocean-continent plate boundaries
E. transform plate boundaries
Answer: A
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A high-grade metamorphic rock whose minerals are segregated into distinct light and dark layers is called:
a) Slate b) Phyllite c) Schist d) Gneiss e) Greenstone
The odorless, invisible gas that can be the most dangerous product of a volcano is ____
a. ?hydrogen sulfide b. ?carbon dioxide c. ?carbon sulfide d. ?sulfur dioxide e. ?hydrogen dioxide
After the Sun, the next nearest star to us is approximately __________ away
a. 4 light-seconds b. 4 light-hours c. 4 light-years d. 4 light-minutes
You are studying the effect of a new pollutant on an ecological community in a lake that has three mysterious species. You sample the concentration of the pollutant in each species for 4 years after the pollutant first appeared. The graph below displays your data. Each species is represented by a different color and marker.
What will be an ideal response?