Rocks Questions and Answers – Page 4

Correct Answer: Option B — Pumice. Pumice is correct because it is formed when gas-rich lava cools rapidly. Pumice is also associated with so porous that some pieces can float on water. A further identifying fact is that Pumice is so porous that some pieces can float on water. Another useful fact is that Pumice is associated with used as an abrasive and lightweight aggregate. Why the other options are incorrect: Option A — Obsidian: It is formed by extremely rapid cooling of silica-rich lava and is associated with glassy texture with conchoidal fracture; those are the identifying facts of Obsidian. Option C — Sandstone: It is formed by compaction and cementation of sand grains and is associated with often shows bedding layers; those are the identifying facts of Sandstone. Option D — Limestone: It is commonly formed from calcium carbonate remains or precipitation and is associated with reacts with dilute acid; those are the identifying facts of Limestone. Exam Takeaway: Link Pumice with “formed when gas-rich lava cools rapidly” and “so porous that some pieces can float on water” for quick revision.

Correct Answer: Option A — Pumice. Pumice is correct because it is a vesicular volcanic rock. Pumice is also associated with formed when gas-rich lava cools rapidly. A further identifying fact is that Pumice is so porous that some pieces can float on water. Another useful fact is that Pumice is associated with used as an abrasive and lightweight aggregate. Why the other options are incorrect: Option B — Obsidian: It is a volcanic glass and is associated with formed by extremely rapid cooling of silica-rich lava; those are the identifying facts of Obsidian. Option C — Sandstone: It is a clastic sedimentary rock and is associated with formed by compaction and cementation of sand grains; those are the identifying facts of Sandstone. Option D — Limestone: It is a sedimentary carbonate rock and is associated with commonly formed from calcium carbonate remains or precipitation; those are the identifying facts of Limestone. Exam Takeaway: Link Pumice with “a vesicular volcanic rock” and “formed when gas-rich lava cools rapidly” for quick revision.

Correct Answer: Option D — Basalt. Basalt is correct because it is common in oceanic crust and lava plateaus. Basalt is also associated with an extrusive igneous rock. A further identifying fact is that Basalt is dark-coloured and fine-grained. Another useful fact is that Basalt is associated with common in oceanic crust and lava plateaus. Why the other options are incorrect: Option A — Pumice: It is used as an abrasive and lightweight aggregate and is associated with a vesicular volcanic rock; those are the identifying facts of Pumice. Option B — Obsidian: It is historically used for sharp cutting tools and is associated with a volcanic glass; those are the identifying facts of Obsidian. Option C — Sandstone: It is commonly used as a building stone and is associated with a clastic sedimentary rock; those are the identifying facts of Sandstone. Exam Takeaway: Link Basalt with “common in oceanic crust and lava plateaus” and “an extrusive igneous rock” for quick revision.

Correct Answer: Option C — Basalt. Basalt is correct because it is dark-coloured and fine-grained. Basalt is also associated with common in oceanic crust and lava plateaus. A further identifying fact is that Basalt is dark-coloured and fine-grained. Another useful fact is that Basalt is associated with common in oceanic crust and lava plateaus. Why the other options are incorrect: Option A — Pumice: It is so porous that some pieces can float on water and is associated with used as an abrasive and lightweight aggregate; those are the identifying facts of Pumice. Option B — Obsidian: It is glassy texture with conchoidal fracture and is associated with historically used for sharp cutting tools; those are the identifying facts of Obsidian. Option D — Sandstone: It is often shows bedding layers and is associated with commonly used as a building stone; those are the identifying facts of Sandstone. Exam Takeaway: Link Basalt with “dark-coloured and fine-grained” and “common in oceanic crust and lava plateaus” for quick revision.

Correct Answer: Option B — Basalt. Basalt is correct because it is formed by rapid cooling of lava at the surface. Basalt is also associated with dark-coloured and fine-grained. A further identifying fact is that Basalt is dark-coloured and fine-grained. Another useful fact is that Basalt is associated with common in oceanic crust and lava plateaus. Why the other options are incorrect: Option A — Pumice: It is formed when gas-rich lava cools rapidly and is associated with so porous that some pieces can float on water; those are the identifying facts of Pumice. Option C — Obsidian: It is formed by extremely rapid cooling of silica-rich lava and is associated with glassy texture with conchoidal fracture; those are the identifying facts of Obsidian. Option D — Sandstone: It is formed by compaction and cementation of sand grains and is associated with often shows bedding layers; those are the identifying facts of Sandstone. Exam Takeaway: Link Basalt with “formed by rapid cooling of lava at the surface” and “dark-coloured and fine-grained” for quick revision.

Correct Answer: Option A — Basalt. Basalt is correct because it is an extrusive igneous rock. Basalt is also associated with formed by rapid cooling of lava at the surface. A further identifying fact is that Basalt is dark-coloured and fine-grained. Another useful fact is that Basalt is associated with common in oceanic crust and lava plateaus. Why the other options are incorrect: Option B — Pumice: It is a vesicular volcanic rock and is associated with formed when gas-rich lava cools rapidly; those are the identifying facts of Pumice. Option C — Obsidian: It is a volcanic glass and is associated with formed by extremely rapid cooling of silica-rich lava; those are the identifying facts of Obsidian. Option D — Sandstone: It is a clastic sedimentary rock and is associated with formed by compaction and cementation of sand grains; those are the identifying facts of Sandstone. Exam Takeaway: Link Basalt with “an extrusive igneous rock” and “formed by rapid cooling of lava at the surface” for quick revision.

Correct Answer: Option D — Granite. Granite is correct because it is widely used as building and decorative stone. Granite is also associated with an intrusive igneous rock. A further identifying fact is that Granite is coarse-grained with visible crystals. Another useful fact is that Granite is associated with widely used as building and decorative stone. Why the other options are incorrect: Option A — Basalt: It is common in oceanic crust and lava plateaus and is associated with an extrusive igneous rock; those are the identifying facts of Basalt. Option B — Pumice: It is used as an abrasive and lightweight aggregate and is associated with a vesicular volcanic rock; those are the identifying facts of Pumice. Option C — Obsidian: It is historically used for sharp cutting tools and is associated with a volcanic glass; those are the identifying facts of Obsidian. Exam Takeaway: Link Granite with “widely used as building and decorative stone” and “an intrusive igneous rock” for quick revision.

Correct Answer: Option C — Granite. Granite is correct because it is coarse-grained with visible crystals. Granite is also associated with widely used as building and decorative stone. A further identifying fact is that Granite is coarse-grained with visible crystals. Another useful fact is that Granite is associated with widely used as building and decorative stone. Why the other options are incorrect: Option A — Basalt: It is dark-coloured and fine-grained and is associated with common in oceanic crust and lava plateaus; those are the identifying facts of Basalt. Option B — Pumice: It is so porous that some pieces can float on water and is associated with used as an abrasive and lightweight aggregate; those are the identifying facts of Pumice. Option D — Obsidian: It is glassy texture with conchoidal fracture and is associated with historically used for sharp cutting tools; those are the identifying facts of Obsidian. Exam Takeaway: Link Granite with “coarse-grained with visible crystals” and “widely used as building and decorative stone” for quick revision.

Correct Answer: Option B — Granite. Granite is correct because it is formed by slow cooling of magma below the surface. Granite is also associated with coarse-grained with visible crystals. A further identifying fact is that Granite is coarse-grained with visible crystals. Another useful fact is that Granite is associated with widely used as building and decorative stone. Why the other options are incorrect: Option A — Basalt: It is formed by rapid cooling of lava at the surface and is associated with dark-coloured and fine-grained; those are the identifying facts of Basalt. Option C — Pumice: It is formed when gas-rich lava cools rapidly and is associated with so porous that some pieces can float on water; those are the identifying facts of Pumice. Option D — Obsidian: It is formed by extremely rapid cooling of silica-rich lava and is associated with glassy texture with conchoidal fracture; those are the identifying facts of Obsidian. Exam Takeaway: Link Granite with “formed by slow cooling of magma below the surface” and “coarse-grained with visible crystals” for quick revision.

Correct Answer: Option A — Granite. Granite is correct because it is an intrusive igneous rock. Granite is also associated with formed by slow cooling of magma below the surface. A further identifying fact is that Granite is coarse-grained with visible crystals. Another useful fact is that Granite is associated with widely used as building and decorative stone. Why the other options are incorrect: Option B — Basalt: It is an extrusive igneous rock and is associated with formed by rapid cooling of lava at the surface; those are the identifying facts of Basalt. Option C — Pumice: It is a vesicular volcanic rock and is associated with formed when gas-rich lava cools rapidly; those are the identifying facts of Pumice. Option D — Obsidian: It is a volcanic glass and is associated with formed by extremely rapid cooling of silica-rich lava; those are the identifying facts of Obsidian. Exam Takeaway: Link Granite with “an intrusive igneous rock” and “formed by slow cooling of magma below the surface” for quick revision.