Petrology Quiz & Flashcards

Limestone is primarily composed of calcite; the other minerals are not dominant in limestone.

Sedimentary rocks form through compaction and cementation; the other processes relate to igneous and metamorphic rocks.

Granite is an intrusive igneous rock formed from slowly cooled magma; it is not sedimentary or metamorphic.

Feldspar weathers chemically more easily than the other minerals, which are more resistant.

Schist forms under high temperature and pressure conditions, unlike the other processes.

Clastic sedimentary rocks are classified by grain size; mineral composition and other factors are less relevant.

Limestone metamorphoses into marble; the other options are not derived from limestone.

Porphyritic texture indicates two stages of cooling, not rapid cooling or chemical alteration.

Wind is the primary agent of erosion in deserts, while water and ice are more common in other environments.

Foliated metamorphic rocks have a layered appearance due to mineral alignment.

Quartz is the most resistant to weathering; the others break down more readily.

Basalt is an extrusive igneous rock; it is not intrusive, sedimentary, or metamorphic.

Feldspar is the most abundant mineral in the Earth's crust, more so than quartz or others.

Fossils are typically found in sedimentary rocks due to their formation environment.

Convection currents in the mantle drive plate tectonics, not gravity or other forces.

Basalt is low in silica compared to granite, which has a higher silica content.

Lithification transforms sediment into rock, while the other processes do not apply.

Quartzite is known for its hardness, which distinguishes it from other rock types.

Garnet is commonly found in metamorphic rocks, unlike the other minerals.

Intrusive rocks form by slow cooling of magma, unlike the other processes.

Quartz is the primary mineral in sandstone, providing its durability and appearance.

Heat and pressure are necessary for metamorphic rock formation, unlike the other conditions.

Gabbro has a different mineral composition than granite, making it distinct.

Heat is a primary agent of metamorphism, unlike wind, ice, or sunlight.

Pumice is less dense than scoria, which often sinks in water due to its higher density.

Limestone is primarily composed of calcium carbonate, unlike the other rocks.

Sandstone is known for its high porosity, allowing it to hold water and oil.

Volcanic glass lacks a crystal structure, unlike rocks with other characteristics.

Basalt commonly forms under the ocean due to volcanic activity at mid-ocean ridges.

Cooling and solidification are essential for igneous rock formation, unlike other processes.

Plagioclase is a major component of basalt, while quartz and calcite are not.

High-grade metamorphism forms gneiss, unlike cooling, deposition, or eruptions.

Gypsum forms in evaporite deposits, unlike quartz, feldspar, or mica.

Batholiths form deep in the Earth's crust from slowly cooled magma.

Limestone is susceptible to chemical weathering due to its calcite content.

Extrusive igneous rocks form from lava cooling on the surface, unlike the other types.

Slate forms from the metamorphism of shale, unlike marble, quartzite, or granite.

Dolostone primarily contains dolomite, unlike the other minerals.

Rhyolite has a high silica content, unlike basalt, gabbro, or peridotite.

Limestone is primarily used in cement production, unlike glass or plastic manufacturing.

Tuff forms from compacted volcanic ash, unlike basalt, schist, or granite.

A sill is parallel to existing layers, while a dike cuts across them.

Conglomerate forms in high-energy environments, unlike shale, limestone, or chert.

Marble is primarily composed of calcite, unlike quartz, mica, or feldspar.

Schist is foliated, unlike marble, quartzite, or granite, which are not.

Volcanic rocks typically have a fine-grained texture due to rapid cooling.

Gneiss forms from the metamorphism of granite, unlike slate, marble, or basalt.

Obsidian has a glassy texture from rapid cooling, unlike granite, gabbro, or limestone.

Chert is primarily composed of silica, unlike calcite, iron, or magnesium.