| – A. B. C. D. E. F. |
Fine-grained |
| – A. B. C. D. E. F. |
Vesicular |
| – A. B. C. D. E. F. |
Coarse-grained |
| – A. B. C. D. E. F. |
Porphytic texture |
| – A. B. C. D. E. F. |
Glassy texture |
|
| A. |
Magma cooled slowly at the surface or upper crust |
| B. |
Magma of high silica content was ejected into the atmosphere, cooling immediately |
| C. |
Magma cooled in two separate environments, first slowly, then more quickly |
| D. |
Magma cooled slowly, beneath the surface |
| E. |
Magma cooled rapidly, contained tiny gas bubbles |
| F. |
Magma that cooled rapidly at the surface or upper crust |
|
