Yes. Lamprey and hagfish are both jawless fishes. They are the only living members of the taxonomical class Agnatha (Greek for “no jaws”).
Experimentally, it was found that this may be possible.
No! After the dinosaurs died out, nearly 65 million years passed before people appeared on Earth. However, small mammals (including shrew-sized primates) were alive at the time of the dinosaurs.
Mineral elements provide the color in fireworks. Barium produces bright greens; strontium yields deep reds; copper produces blues; and sodium yields yellow.
You can view a national map of hardness in surface water at water hardness map.
YES, Visit our National Geospatial Program page or call 1-888-ASK-USGS for our information package on digital cartographic data.
Yes, it is not unusual for salt marshes to experience dieback in small patches in some years. However, these areas are usually less than an acre or so in size and generally regenerate the next year or over the next several years.
The USGS Publications Warehouse provides an online catalog where you can place orders, view price information, download scanned versions and view a list of recent publications.
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