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Soal Batuan Beku

Total questions: 10

Worksheet time: 5mins

Name
Class
Date
1.

Igneous rocks are formed through the main process ...

a)

Weathering of minerals at the surface

b)

Deposition of clastic particles in basins

c)

Freezing of magma/lava into crystalline rocks

d)

Metamorphism under high directed pressure

e)

Chemical precipitation from hydrothermal solutions

2.

Phaneritic texture in igneous rocks indicates ...

a)

Very rapid cooling at the surface

b)

Slow cooling so that crystals are clearly visible

c)

Two-stage cooling with phenocrysts

d)

Explosive pyroclastic processes

e)

Formation of volcanic glass without crystals

3.

The intrusive-extrusive pairs that are compositionally equivalent are ...

a)

Granite - Basalt

b)

Diorite - Rhyolite

c)

Gabbro - Basalt

d)

Peridotite - Andesite

e)

Syenite - Obsidian

4.

The QAPF diagram is most appropriately used to classify ...

a)

Phaneritic plutonic rocks with measurable modal Q-A-P-F percentages

b)

Pure volcanic glass rocks

c)

Fragmental pyroclastic deposits

d)

Foliated metamorphic rocks

e)

Tectonic breccia

5.

The correct order of the discontinuous branches of the Bowen Reaction Series is ...

a)

Olivine → Amphibole → Pyroxene → Biotite

b)

Olivine → Pyroxene → Amphibole → Biotite

c)

Pyroxene → Olivine → Biotite → Amphibole

d)

Amphibole → Biotite → Olivine → Pyroxene

e)

Biotite → Amphibole → Pyroxene → Olivine

6.

Porphyritic texture indicates ...

a)

Uniform very rapid cooling

b)

Slow cooling throughout

c)

Two-stage cooling: slow at depth then rapid during eruption

d)

Post-magmatic recrystallization

e)

Degassing results in glassy texture

7.

Extrusive igneous rocks with glassy, amorphous, and very fine texture are ...

a)

Andesite

b)

Obsidian

c)

Crystalline tuff

d)

Agglomerate

e)

Dacite

8.

The dark-colored mafic rocks that predominantly compose the oceanic crust and are commonly aphanitic in extrusive settings are ...

a)

Rhyolite

b)

Andesite

c)

Basalt

d)

Dacite

e)

Trachyte

9.

The main geometric difference between a sill and a dike is ...

a)

Sill cuts across layering, dike is parallel to layering

b)

Sill is parallel/concordant to layering, dike cuts across layering (discordant)

c)

Sill is always phaneritic, dike is always aphanitic

d)

Sill only forms in volcanic arcs

e)

Dike only exists in oceanic crust

10.

Texture with very coarse crystals (often >1 cm) in shallow intrusive bodies rich in volatiles is called ...

a)

Aphanitic

b)

Phaneritic

c)

Pegmatitic

d)

Vesicular

e)

Pyroclastic