Physical Geology and Mineralogy

Hawaiian volcanoes like Mauna Loa and Kilauea are classic examples of shield volcanoes, which are built almost entirely of fluid lava flows. These form broad, gently sloping domes shaped like a warrior's shield, unlike composite volcanoes (steep, layered) or the nonexistent terms 'broad' or 'core' volcanoes.

a form of lava when erupted

Caldera: After the explosion, these volcanoes collapse on themselves rather than building any tall structure

Flood basalt province, this type of volcano pour out fluid lava that flows for large distance.

collapsed depressions after the explosion of “caldera” type volcano.

When lava or magma cools and solidifies, it forms igneous rocks. This can happen either extrusively (lava cooling on Earth's surface forming basalt, rhyolite) or intrusively (magma cooling underground forming granite, gabbro). Manganese is an element, not a rock type; metamorphic rocks form from existing rocks under heat/pressure.

Batholiths are massive igneous rock formations that form when magma cools and solidifies deep underground, representing the cooled portions of large magma chambers. They are the largest intrusive bodies (e.g., Sierra Nevada batholith). Dykes are vertical intrusions, laccoliths are dome-shaped, and phacoliths are concave-convex forms.

The Richter scale, developed by Charles Richter in 1935, is the most well-known magnitude scale for measuring earthquake strength based on seismic wave amplitude. The Mercalli scale measures intensity (observed damage/effects), not magnitude. Kite and Avalanche scales are not relevant to seismology.

Abyssal plains are extensive, flat regions of the ocean floor that lie between continental margins and mid-ocean ridges. They are among the flattest features on Earth, formed by the deposition of sediments over millions of years. Ridge plain is not a standard geographical term, while continental plain and 'Reep plain' are incorrect in this context.

S -waves or secondary waves which only passes through the solid forms

Wegener proposed two main forces to explain continental drift: pole-fleeing force (centrifugal force due to Earth's rotation) and tidal force (gravitational pull of the moon and sun). While his theory was incomplete, these were the mechanisms he suggested. Gravitational force, solar energy, and wind energy are not the specific forces Wegener identified.

McKenzie, Parker, and Morgan were all key advocates and developers of the plate tectonics theory in the 1960s. McKenzie and Parker worked on plate kinematics, while Morgan proposed the concept of mantle plumes and hotspots. All three made fundamental contributions to establishing plate tectonics as the unifying theory of geology.

The lithosphere consists of the crust and the uppermost solid part of the mantle. It is the rigid outer layer of Earth that is broken into tectonic plates. Options A, B, and C are incorrect because the core is not part of the lithosphere, and 'upper core' is not a standard geological term.

divergent boundary, American plates are separated from the Eurasian and African plates

Among the options, the Indo-Australian plate (including New Zealand) is the major plate, though typically referred to as the Indo-Australian Plate. Philippine, Arabian, and Cocos plates are all minor or secondary plates. The seven major plates are: Eurasian, Pacific, Indo-Australian, African, North American, South American, and Antarctic.

In convergent boundaries, the subduction zone is where one tectonic plate descends beneath another into the mantle. This process creates deep ocean trenches, volcanic arcs, and earthquakes. 'Convergent zone' is too general, while 'deduction zone' and 'original site' are not geological terms.

Magma is the primary source of minerals as it contains dissolved elements and compounds that crystallize into various minerals as it cools. Most mineral deposits originate from magmatic processes through igneous activity or hydrothermal fluids derived from magma. While some minerals come from other sources, magma is the dominant contributor to mineral formation.

All statements are true about feldspar: (1) All feldspars contain silicon and oxygen as fundamental elements in their structure, (2) Feldspar is essential in ceramic and glass manufacturing due to its fluxing properties, and (3) Feldspar makes up approximately 41% of the continental crust by weight, making it the most abundant mineral group.

Quartz is the most important and abundant component in both sand (as individual grains) and granite (as a major mineral constituent). It is extremely hard, chemically resistant, and makes up about 12% of the continental crust. Feldspar, pyroxene, and amphibole are also present but quartz is the dominant component.

All statements are correct about quartz: (1) Quartz consists entirely of silica (SiO2), (2) Due to its piezoelectric properties, quartz is used in radio and radar equipment for frequency control, and (3) Quartz is a major component of granite, typically making up 20-60% of the rock. These properties make quartz one of the most economically significant minerals.

pyroxene, it forms the 10 % of the earth's crust

Mica is predominantly found in both igneous and metamorphic rocks, occurring as sheets or flakes due to its perfect basal cleavage. While quartz and pyroxene are common in igneous rocks, and amphibole in metamorphic rocks, mica is distinctive for being abundant in BOTH rock types. Biotite and muscovite are the two most common mica minerals.

Olivine is a gemstone-quality mineral used in jewelry, particularly peridot (gem-quality olivine). While mica and feldspar have industrial uses, and pyroxene is primarily an academic mineral, olivine's transparent green varieties are valued as gemstones. Peridot is one of the few gemstones that occurs in only one color (olive green).

Amphibole is one of the two main mineral groups that form asbestos (the other being serpentine). While chrysotile (serpentine) accounts for about 95% of commercial asbestos production, amphibole asbestos minerals like crocidolite and amosite are also significant asbestos varieties used in various industrial applications.

Hornblende is an amphibole mineral, not a form of mica. Mica is a distinct silicate mineral group (phyllosilicates) known for its perfect basal cleavage, while hornblende belongs to the amphibole group with different crystal structure and properties. The other statements about mica are factually correct.