State, which sentences, is T (true) or F (false) according to the text.
Date: 2015-10-07; view: 501.
Can these terms and phrases be understood without translating? Why?
Read the following phrases and give the Russian equivalent.
Fig. 27 Various modes of occurrence of igneous rocks
| accelerated process | unequal hardness |
| crystallized magma | adjacent rocks |
| weakly deformed minerals | mode of occurrence |
| rapidly cooled rocks | volcanic ash and dust |
| rocks formed by solidification | coarse-grained minerals |
| rocks exposed on the Earth's surface | glassy surface |
| transformation caused by new conditions | rock fissures |
Intrusiveand extrusiverocks; plutonic intrusion; large crystals; volcanic rocks; mountain zones; zones of major deformation; mineral grains; granitesanddiorites; the group of intrusiveor plutonicrocks; straight parallelwalls; gigantic crystals; slowly-cooled batholiths; thick laccoliths; otherplutonites; coarse-grainedpegmatites; lava flow.
1. Igneous rocks have been formed by sedimentation.
2. Intrusive rocks have been formed by the cooling of rocks of the Earth's crust.
3. Extrusive rocks have been formed the same way as intrusive rocks.
4. The grain size of igneous rocks depends on mode o occurrence.
5. Exposed igneous rocks are numerous in mountain zones.
6. Granites and diorites belong to the group of extrusive rocks.
7. As a rule, granite may occur in dykes.
8. Pegmatites do not belong to the group of plutonic or intrusive rocks.
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