B. The lithosphere is denser than the asthenosphere.
C. The asthenosphere is denser than the lithosphere.
D. The lithosphere has the same density as the core.
Answer:
A
Explanation:
Isostatic equilibrium is used to state why some regions of the lithosphere have greater elevation than others. The crust ‘floats’on the‘liquid’ mantle below and different regions of the crust submerge into the mantle differentially depending on their local densities or weight. Heavier regions such as in mountainous region (like the Himalayas) are sunken deeper into the mantle that other regions. Every local region has its own local isostatic equilibrium.
Answer:
The correct option is Option C
i.e. Asthenosphere is denser than lithosphere.
Explanation:
Asthenosphere is the layer situated below the lithosphere.
Theory of isostasy says that the layers above the other layer must have lesser density. This has two explanations. Firstly, if its not hold, then the denser above layer would sink below the less denser bottom layer. Secondly, as we go inwards, the pressure increases. This leads to the lower layers have greater density. So, as Asthenosphere is situated below the lithosphere, it has higher density.
Answer: C. False colors are added to images to make some structures more noticeable.
False color refers to the special photography condition. This technique utilizes visible light range of the elctromagnetic spectrum to develop photograph. A false color image depicts an object in colors that differs from the actual color of the objects. This is used to capture the image of objects which cannot be detected in normal photographic techniques. It is a potent aerial photographic technique, which is used to capture large area of a region. It gives a definite color to vegetation, soil cover, river and other water body in the image.
False colors are added to images to make some structures more noticeable is the most accurate option because of the following reasons:
1. Electron microscope does not use beam of light to develop image but focuses beam of electrons to develop image.
2. Compound microscope does not use beam of electrons to develop image.
4. Electron microscope cannot be used for observation of living organisms, as high energy electron beam to develop image will be lethal for these living organisms.
Geographic isolation is the main cause of speciation.
Hybrid organisms always produce sterile offspring.
If a population is spread out over too large area, they may become extinct.
Speciation can only happen when a population has very low genetic diversity.
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A population of oak trees is separated by a large canyon. Which of the following is most likely to occur?
The two populations will show cospeciation.
The genetic variation between the two populations will increase.
Natural selection will cause one population to die, and the other to live.
Both populations will stop evolving.
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Choose ALL the answers that apply.
Extinction:
only happens above the species level
cannot happen to more than one species at a time
can be caused by habitat destruction
happens when a species or population dies out
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Which of the following statements is true?
Gene flow evens out genetic differences between populations.
Genetic drift increases the genetic differences between populations.
Natural selection, mutation, and genetic drift are random events.
The bottleneck effect increases the genetic diversity of a population.
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A species is endangered if it _____.
no longer exists anywhere on earth
is in danger of becoming extinct
is not native the environment
has high genetic diversity
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Genetic drift _____.
is a predictable event
increases genetic differences between populations
happens when random events change the genotype of a population
happens when well-adapted organisms survive and reproduce more often than poorly-adapted organisms
Answer: C, If a population is spread out over too large area, they may become extinct.
Answer:
A species is endangered if it is in danger of becoming extinct
Explanation: