Q. Consider the following statements:

1. In sedimentary rocks minerals may occur in the cracks, crevices, faults or joints.
2. The smaller occurrences are called veins and the larger are called lodes.
3. Major metallic minerals like tin, copper, zinc and lead etc. are obtained from veins and lodes.

Which of the above mentioned statements is/ are correct?
Answer: Only 2 and 3
Notes: In igneous and metamorphic rocks minerals may occur in the cracks, crevices, faults or joints. The smaller occurrences are called veins and the larger are called lodes. In most cases, they are formed when minerals in liquid/ molten and gaseous forms are forced upward through cavities towards the earth’s surface. They cool and solidify as they rise. Major metallic minerals like tin, copper, zinc and lead, etc. are obtained from veins and lodes.