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2 years ago

Which of the following statements about minerals is false

Geography

2 answers:

den301095 [7]2 years ago

8 0

A. a mineral can only break in one way

Solnce55 [7]2 years ago

4 0

Answer:

A. a mineral can only break in one way

Explanation:

Cleavage is the ability of crystals to break along preferred crystallographic directions with the formation of a glossy surface. In the characterization of minerals the cleavages are described as:

• perfect cleavage: crystal separates into perfect surface plates (eg micas)

• good cleavage: separation takes place in certain directions, often forming stepped surfaces (eg calcite, cyanite)

• distinct cleavage: when the formation of equal and uneven surfaces by breaking occurs (eg feldspars, hornblende)

• imperfect cleavage: cleavage surfaces are uneven (eg beryl)

• missing cleavage: no cleavage plan (eg quartz)

Minerals may have cleavage surfaces on:

a) 3 directions - eg calcite, galena

b) 2 directions - Ex .: feldspar

c) 1 direction - Ex .: micas, talc

d) absent - eg quartz, tourmaline

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Dvinal [7]

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2 years ago

Marque la alternativa que contenga una importancia económica de los lagos. A) Permite el comercio fluvial. B) Hace posible la pe

Licemer1 [7]

Answer:

La opción correcta es C. Los lagos son ideales para la construcción de centrales hidroeléctricas.

Explanation:

Una central hidroeléctrica es una central eléctrica que utiliza agua corriente o que cae para poner una turbina en movimiento y generar electricidad a través de este. El uso de energía hidroeléctrica no produce contaminación ni residuos radiactivos peligrosos. Por eso se considera que las centrales hidroeléctricas generan energía verde.

En este contexto, los lagos son fundamentales para la construcción de las represas que almacenan el agua que se utiliza para hacer funcionar las centrales hidroeléctricas, ya que en el caso de los ríos, muchas veces ocurre que el ancho del caudal no es suficiente para poder realizar una construcción efectiva, con lo cual se construyen embalses artificiales que son un gasto extra de tiempo y dinero.

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2 years ago

Which of the following hazards would you expect to see at a CONVERGENT plate boundary associated with a continent-continent COLL

mixer [17]

Answer:

Option (C)

Explanation:

The sharing of a convergent plate boundary between two continental plates results in the formation of a sandwich pattern, where the rocks at the edges of both the plates are crushed and crumbled and folded. Here the magma beneath the plates cannot rise up to the surface due to its high thickness, so it does not lead to the formation of volcanoes. For example, the Himalaya.

There is the possibility of occurring frequent landslides at the higher elevated mountainous areas due to the steeper slope of the mountains. It can also lead to the occurrence of flood, as there is the presence of plateaus that are formed at the top of the mountains that has the ability to trap water within them.

Thus, the correct answer is option (C).

3 0

2 years ago

Melting above a subducting slab produces mafic magma, as described in Exercise 5.10, yet intermediate rocks (andesite, diorite)

Ksju [112]

Answer:

The intermediate magma has a heterogeneous structure, since it has a part of Silice, approximately 50-60% to be more exact.

When it turns into lava, it produces rocks like the Andesite and, in the opposite case of its crystallization, it forms rocks like the Diorite.

A comparison of felsic magma is much more viscous.

It is important to clarify that this magma is a type of primary magma, that is to say that they are magmas formed from the fusion of the rocks of the mantle or the crust.

Explanation:

The fusion of these rocks are what would give rise to the intermediate magma, this intermediate magma is a primary magma, like the mafic and felsic.

The primary magmas unlike the derived magmas is the origin or the reason for how they are formed, which is what we write above, derived magmas usually form differently since they are the product of the evolution or changes that magmas undergo primary

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2 years ago

Although these devices can be of great value to archaeologists, some users of this popular type of magnetism-based remote-sensin

Elza [17]

Answer: Metal Detectors

Explanation: Metal detectors are inexpensive and easy to use equipment used to discover relics of the past. While it is useful in archaeology as a tool that discovers objects from the past quite easily, it is also a threat to archaeology. Some hobbyists and looters who come across archaeological finds which may be important to understanding past civilizations or a different era do not report these finds. Even worse, some looters knowingly infringe on archaeological sites and are aided by the metal detectors.

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2 years ago