2023 · Q112
Consider the following statements about rock structure:
- 1Conglomerates are clastic sedimentary rocks.
- 2Slate is a non-clastic sedimentary rock.
- 3Granite is a plutonic igneous rock.
- 4Basalt is an extrusive igneous rock.
Which of the statements given above are correct?
indian-world-geographygeomorphology
- A1, 2 and 3 only
- B3 and 4 only
- C1 and 2 only
- D1, 3 and 4 only
Explanation
Conglomerates are clastic sedimentary rocks formed from cemented rounded fragments (1). Granite, which cooled slowly beneath the surface, is the classic plutonic igneous rock (3), and basalt, erupted at the surface, is extrusive (4). Slate, however, is a metamorphic rock derived from shale, not a sedimentary rock at all, so statement 2 is wrong. Hence statements 1, 3 and 4 only.