1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
larisa [96]
2 years ago
14

If surface mines tend to cause greater environmental impacts, why are they used?

Biology
1 answer:
Virty [35]2 years ago
4 0
Surface mines, in metallic mining called open pits are used because they are much more economical for large low grade deposits in which the mineralization as in copper is widely disseminated and needs a bulk mining method such as an open pit.The size is usually numbered in say approximately 50 million to say well over a billion tonnes (metric tons) and underground mining methods mostly could not move this amount of material. Electric shovels and trucks up to or greater than 200 tonnes per truck are used to move this material and it is not uncommon to move 300,000 tonnes per day.

Underground is much more labour intensive and much more expensive so needs a high grade orebody. An open pit can do  a lot to preserve the environment by reclaiming the waste dumps ie re-sloping and planting grass for the deer. Also, open pits are no hunting areas so allow a safe haven for large mammals like the moose in Canada.
You might be interested in
What structure does an amoeba ,a one-celled organism, use to movie ingest and transport materials within the cell , because it h
Vinvika [58]

Answer:

pseudopodia(false legs)

Explanation:

a protrusion formed by the amoeba towards its food to engulf it...you know it has no particular shape so it uses false legs

8 0
3 years ago
Chimeric mice are generated where approximately 50% of the cells in the animal are genetically MHC class I-deficient.
Firdavs [7]

Chimeric mice are generated where approximately 50% of the cells in the animal are genetically MHC class I-deficient. The other 50% are deficient for the herpes virus receptor, HVEM, but do express MHC class I molecules. When these mice are infected with herpesvirus by intraperitoneal injection, a robust virus-specific CD8 T cell response is detected at day 7 post-infection in the spleens of the infected mice.

Chimeric mice are generated where approximately 50% of the cells in the animal are genetically MHC class I-deficient - Immunobiology

: a branch of biology concerned with the physiological reactions characteristic of the immune state

To learn more about immunobiology

https://brainly.in/question/6400587

#SPJ4

8 0
1 year ago
At what stage of development does the brain essentially reach its adult size?
photoshop1234 [79]
The stage at which the development of the brain reaches its adult is the middle childhood. A child's Brain undergoes a period of development from birth to three-producing more than a million neural connections each second. This development is influenced by many factors, which include the child's relationships, experiences and environment.
6 0
3 years ago
Which perspective most clearly focuses on how we learn observable responses? a psychodynamic b humanistic c evolutionary d biolo
IgorC [24]
The answer is C. Evolutionary
5 0
3 years ago
Read 2 more answers
Which best describes the law of independent assortment?
PilotLPTM [1.2K]

Answer:

Which best describes the law of independent assortment?

Alleles of a trait separate independently when gametes form.

Explanation:

8 0
2 years ago
Read 2 more answers
Other questions:
  • People began measuring intelligence through tests roughly __________ years ago.
    5·1 answer
  • Sodium (Na) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence elec
    11·2 answers
  • Which of the following personal health practices should a person follow to prevent obesity? A) Limit spending time outdoors in s
    5·2 answers
  • Over the last several decades, what have researchers discovered about atmospheric CO2 levels?1 They have decreased.2 They have i
    6·1 answer
  • What is the fitness of an organism?
    14·1 answer
  • What does evidence show about radial symmetry in invertebrates? a. all invertebrates with radial symmetry are closely related b.
    8·1 answer
  • Where would you find DNA in plant and animal cells?
    11·2 answers
  • Desertification is cause by___
    7·1 answer
  • Someone plss help me {no links please} i barely have any points so please only answer if you know
    8·2 answers
  • Engineers often use designs that mimic shapes found in nature, such as flippers, wings, and beaks. Construct an argument that su
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!