Category: Science - Earth/Agricultural/Farming
Produced by Heather Clark, Tom Cosmas and the Online Distributed Proofreading Team at http://www.pgdp.net (This book was produced from scanned images of public domain material from the Google Print project.)
63. _River-action._--The water of streams and rivers almost invariably contains in solution one or more chemical compounds, and in this respect does not differ from the water of...
6. Part 674. _Coral_ is the calcareous skeleton of certain small soft-bodied gelatinous animals called _actinozoa_. These zoophytes flourish only in clear water, the temperature of which...
4. Part 452. True _igneous rocks_ occur either in beds or as irregular amorphous masses. When they occur as beds interstratified with aqueous strata, they are said to be _contemporaneous...
8. Part 892. _Proofs of Cosmical Changes of Climate._--From the preceding remarks it will be also apparent that fossils teach us much regarding the climatology of past ages. They tell us...
7. Part 783. Mention has already been made of the fact, that the heated matters ejected from volcanoes, or forcibly intruded into cracks, crevices, &c., occasionally _alter_ the rocks wi...
1. Part 1Produced by Heather Clark, Tom Cosmas and the Online Distributed Proofreading Team at http://www.pgdp.net (This book was produced from scanned images of public domain material f...
2. Part 2SILICATES.--These are by far the most abundantly occurring minerals. The species are also exceedingly numerous, but we may note here only a few of the more important. They are c...
3. Part 336. _Mud-cracks and Rain-prints._--The surfaces of some beds occasionally exhibit markings closely resembling those seen upon a flat sandy beach after the retreat of the tide--h...
9. Part 982. What is lava? Describe the general appearance and mode of progression of a stream of lava. What effect is produced upon fragments of rock caught up and inclosed in lava; and...