Term
|
Definition
| the process of injecting a different kind of rock type into the existing rocks |
|
|
Term
|
Definition
| horizontal, shelf-like igneous formations |
|
|
Term
| Sills did this during latter stages of Flood |
|
Definition
| reduced the rate of erosion of underlying sedimentary rocks |
|
|
Term
| How intrusive volcanism occurs |
|
Definition
| Magma works way into cracks and spaces inside crust near vents |
|
|
Term
| sills do this once exposed |
|
Definition
| act as a cap to protect against erosion |
|
|
Term
|
Definition
| vertical, solidified remnants of volcanoes, across strata |
|
|
Term
|
Definition
| few centimeters to many meters - relatively small |
|
|
Term
| most important intrusive igneous features |
|
Definition
|
|
Term
|
Definition
| intrusive structure - magma collected and cooled in huge chambers |
|
|
Term
|
Definition
| largest plutons - borad and lumpy - over 40 square miles |
|
|
Term
|
Definition
| smaller plutons, dome shaped |
|
|
Term
|
Definition
|
|
Term
|
Definition
| very small - less than a square km - vertical. May have supplied vents in the past |
|
|
Term
|
Definition
| rate of temperature change with depth |
|
|
Term
| reason geothermal gradient exists |
|
Definition
| earth's core is hotter than the surface - increases as you go deeper |
|
|
Term
| Secular view of heat source (geothermal gradient) |
|
Definition
leftover from earth's formation
Collisions of planetesimals
radioactive decay |
|
|
Term
| Young-earth view - source of heat (geothermal gradient) |
|
Definition
Part of God's plan
Radioactive decay could contribute |
|
|
Term
|
Definition
| continuous flow of water - driven by gravity |
|
|
Term
| how heated groundwater can work its way to surface |
|
Definition
| works way through cracks or pores - cool water sinks downward |
|
|
Term
|
Definition
| heated water rises as a liquid - contains dissolved minerals |
|
|
Term
|
Definition
| stepped rock formations - minerals settle out when water cools |
|
|
Term
|
Definition
| hot springs with thick deposits of tephra |
|
|
Term
|
Definition
| water rises to surface as steam - ejects water at regular intervals - Old Faithful |
|
|
Term
| determines when a geyser erupts |
|
Definition
|
|
Term
|
Definition
| a mineral chemically similar to quartz - deposit near geyser's vent |
|
|
Term
|
Definition
| heat produced by magma intrusions |
|
|
Term
| Uses of geothermal energy |
|
Definition
| electricity, heating homes, fish farms, greenhouses, etc. |
|
|
Term
|
Definition
| rising steam turns turbines - generate electricity. 87% of Iceland homes |
|
|
