I minerali e le rocce - Exercises in English #609896

Minerals hardness and Mohs scale

Mineral A is easily scratched by quartz, but cannot be scratched by fluorite.

a. In between what degrees of hardness does the given mineral lie?

b. With what other minerals of the Mohs scale should A be scratched with, in order to determine its hardness?

Risposta aperta

Minerals

The mineral made of SiO₂ is

A:

olivine

B:

quartz

C:

calcite

D:

gypsum

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Gypsum

Gypsum is classified as a

A:

carbonate

B:

sulphide

C:

sulphate

D:

oxide

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Structure of minerals and rocks

a. The smallest three-dimensional unit representing the composition and structure of a crystal is called .
b. The most commonly occurring structure of sedimentary rocks is .

Completamento aperto

Oceanic structures

Which of the following structures are not found among the oceanic ones?

A:

continental shelves

B:

cratons

C:

continental slopes

D:

trenches

E:

ridges

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Minerals and rocks

True or false?

A:

The lithostatic pressure acts in all directions.

B:

Rhyolite is an intrusive acid rock.

C:

Gypsum is a chemical sedimentary rock.

Vero o falso

Earth's crust

The three elements most present in Earth’s crust are

A:

silicon, iron and magnesium

B:

aluminium, silicon and oxygen

C:

calcium, silicon and oxygen

D:

iron, aluminium and oxygen

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