Dolerite outcrop. Dolerite is an intrusive igneous rock, meaning that it was formed from magma (molten rock) that solidified beneath the Earth's surfa
RMID:Image ID:2ADFF3N
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Science Photo Library / Alamy Stock PhotoImage ID:
2ADFF3NFile size:
50 MB (3.6 MB Compressed download)Releases:
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3457 x 5058 px | 29.3 x 42.8 cm | 11.5 x 16.9 inches | 300dpiDate taken:
8 December 2003Photographer:
DIRK WIERSMA/SCIENCE PHOTO LIBRARYMore information:
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.).