| Chapter 15 | Chapter 17 | Chapter 18 | Chapter 24 | Chapter 26 | Chapter 27 | Chapter 28 | Chapter 29 | Chapter 30 |
|---|---|---|---|---|---|---|---|---|
| pH We use the ________ scale to measure concentrations of hydrogen ions in a solution. |
aquifers Over time, groundwater accumulates within ________ of porous rock layers. |
riparian A(n) ________ area is land adjacent to a stream. |
fracking A technique using explosives in horizontal wells to recover underground shale gas is called ________ . |
axial tilt The Milankovitch cycles consist of axial precession, ________ , orbit eccentricity. |
isotopes Atoms of an element with different mass numbers are called ________ . |
heat Ground-source ________ pumps take advantage of temperature differences between the soil and air to heat or cool a house. |
cellulosic Switchgrass and poplar trees are crops whose cellulose can be processed for ________ ethanol. |
refuse The four R’s of environmentally responsible consumer choice starts with ________ . |
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