Dolerite outcrop. Dolerite is an intrusive igneous rock,meaning that it was formed from magma (molten rock) that solidified beneath the Earth's surface. Where magma rises up vertically from a magma chamber through bedding planes of other rocks it forms a dyke. Over time the rock becomes exposed at the surface. In this case,the dolerite rock of the dyke is more resistant to weathering and erosion than the country-rock,hence it protrudes from the surface of the flat plain. The dolerites of the Pilbara region of western Australia are covered with tussocks of spinifex grass (Spinifex sp.) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 3457 px × 5058 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
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