What does freezing and thawing do to rocks?
Regional SpecificsFreezing and thawing of water in the joints and cracks of rocks creates smaller fragments with more surface area, making rocks more susceptible to chemical and biological weathering. What happens to a rock when it freezes? Scientists have observed a process called freeze-thaw. That process occurs when the water inside of rocks freezes and expands.
How big are the Black Hills?
Regional SpecificsHow many miles long is the Black Hills? 125 miles long The Black Hills are in western South Dakota and northeastern Wyoming, covering an area 125 miles long and 65 miles wide. They encompass rugged rock formations, canyons and gulches, open grassland parks, tumbling streams, deep blue lakes, and unique caves. How big is the
What volcano has mafic lava?
Regional Specificsshield volcanoshield volcano (Figure 9.9). Shield volcanoes are very broad at the base and have relatively gentle slopes. What types of volcanoes are mafic? So mafic/basaltic volcanoes are fairly quiescent, intermediate/andesitic volcanic eruptions are moderately explosive, and felsic/rhyolitic volcanoes may be extremely explosive. So, mafic lavas are hot , low in silica and volatiles, and
What is the geological history of Hawaii?
Regional SpecificsA hotspot beneath the Pacific Plate created Hawaii’s volcanic islands. As this hotspot has remained stationary over the last 40 million years, the plate above has drifted west-northwest at a rate of three and a half inches per year. Over time, the hotspot resulted in 82 volcanoes emerging to form the Hawaiian Ridge. When was
What is the texture of rock salt?
Natural EnvironmentsRock Salt Type Sedimentary Rock Texture Nonclastic; Fine-grained Composition Halite Color Colorless Miscellaneous Crystalline; Tastes salty; Hardness < Glass Is rock salt hard or soft? Hardness and Weight Mineralogists rate rock salt at 2 to 2.5 for hardness. This means it is quite soft, its surface able to be scratched with a fingernail. What is
What technology is used in marine biology?
Regional SpecificsMarine biologists use computers in their research and writing. They use biostatistical programs to draw conclusions about marine populations. They use microcomputer programs for word-processing, entering data on a spreadsheet, putting together presentations and searching the Internet for research publications. What technology do marine biologists use? They use equipment including boats, scuba gear, nets, traps,