Term
| Two most abundant minerals in a granite are: |
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Definition
| potassium feldspar and quartz |
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Term
| two most abundant minerals in an adesite are: |
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Definition
| soda-calcium feldspar and hornblende |
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Term
| two most abundant minerals in a basalt are: |
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Definition
| calcium-rich feldspar and pyroxene |
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Term
| Magmas are typically characterized by their : |
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Definition
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Term
| Which one of the following pairs may be considered to be chemically very similar: |
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Definition
| rhyolite and granite; basalt and gabbro |
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Term
| Which one of the following rocks always occurs as an intrusive igneous rock: |
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Definition
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Term
| which one has the lowest silica content |
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Definition
|
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Term
| in the history of a magma, its silica content may be increased by |
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Definition
| the process of fractional crystallization |
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Term
| magmas of different compositions may result from |
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Definition
| different degrees of partial melting |
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Term
| which one of the following rocks cannot generally be melted by an andesite magma: |
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Definition
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Term
| the most abundant gas generally in magmas is |
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Definition
|
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Term
| probably the second most abundant gas in most magmas is: |
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Definition
|
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Term
| the highest amount of gas is generally associated with |
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Definition
|
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Term
| an important role of gases is to |
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Definition
| decrease the melting temperature of a rock |
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Term
| which one of the following rocks generally has the highest gas content |
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Definition
| granite, rhyolite, pegmatite |
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Term
| the occurrence of rhyolite is less abundant than that of granite because |
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Definition
| magmas from which the rocks form are rich in silica content making the magmas most often incapable of reaching the surface where they can crystallize |
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Term
| the texture of an igneous rock provides a clue to the |
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Definition
| cooling or crystallization history of the magma |
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Term
| some magmas originate very deep (a few hundred kilometers) within the mantle by |
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Definition
|
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Term
| which one of the following magmas may be produced by partial melting of an andesite rock |
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Definition
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Term
| the following rock is most abundantly found on the ocean floor |
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Definition
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Term
| the following texture in a rock implies formation on the floor of a deep ocean |
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Definition
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Term
| a lava temperature implies |
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Definition
| high silicon content of the lava |
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Term
| a batholith consists predominantly of |
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Definition
|
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Term
| the Hawaiian volcanic activities are believed to be linked to |
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Definition
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Term
| the chain of volcanic mountains, forming the Cascade Mountains, along the west coast of North America, represents volcanic activities |
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Definition
| along convergent boundaries |
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Term
| Nuees ardentes type volcanic eruption, as illustrated by the 1902 eruption of Mont Pelee in the Caribbean Islands, is one with discharges of |
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Definition
| gases and rhyolitic flows |
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Term
| The most abundant lava flows among divergent plate boundaries is |
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Definition
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Term
| the most abundant lava flows among convergent plate boundaries is |
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Definition
|
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Term
| the excessive pressure needed for the Krakatoa explosion of 1883 was most likely related to |
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Definition
| superheated steam generated by intrusion of ocean water in the proximity of the magma chamber |
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Term
| the Vesuvius eruption of 72 AD that destroyed the city of pompeii was caused by volcanic activities related to |
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Definition
| convergent plate boundaries |
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Term
| Fissure eruption is rare in the recent history of Earth. The youngest record of such an eruption is in Iceland and it occurred about little more than 200 years ago. The type of rock typically associated with such an eruption |
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Definition
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Term
| The most important role of disentegration in weathering is |
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Definition
| to expose new minerals for chemical reactions |
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Term
| Rhyolite weathers more rapidly than granite because |
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Definition
| rhyolite is a fine-grained rock, whereas granite is a coarse grained rock |
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Term
| basalt weathers more rapidly than andesite because |
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Definition
| mineralogical composition |
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Term
| Which one is likely to be the most stable under weathering conditions? |
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Definition
|
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Term
| which of the following minerals is most stable under weathering conditions? |
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Definition
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Term
| Which rock would be the most resistant to chemical weathering? |
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Definition
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Term
| which of the following minerals can promote the rate of chemical weathering |
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Definition
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Term
| Chemical weathering of rocks in a valley is more pronounced than that of the same rocks on a hill top because |
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Definition
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Term
| which one of the following minerals cannot alone form clay minerals by weathering |
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Definition
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Term
| which one of the following minerals exposed to a weathering condition leaves essentially no secondary mineral product |
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Definition
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Term
| which one of the following minerals exposed to a weathering condition leaves a secondary mineral of iron oxyhydroxide composition: |
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Definition
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Term
| which one of the following minerals exposed to a weathering condition will contribute potassium to river and ground waters |
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Definition
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Term
| which one of the following minerals exposed to a weathering condition would contribute calcium to river and ground waters |
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Definition
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Term
| which soil has practically no, or very little amount of clay minerals |
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Definition
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Term
| which one of the following minerals does not influence the acidity of water |
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Definition
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Term
| which one is a source of acid that can help decompose or weather rocks and minerals |
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Definition
|
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Term
| the presence of organic matter |
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Definition
| increases the rate of chemical weathering |
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Term
| which one among the following minerals is least stable under weathering conditions |
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Definition
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