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3 years ago

Climate change and its consequences in South Africa?

1 answer:

3 0

Water is the primary medium through which the impacts of climate change are being felt in South Africa. The lack of fresh water already is a problem and climate change wouldn't help.

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13) The overall direction of the major cold ocean currents is largely

Ksenya-84 [330]

The major cold ocean current flows equatorward, along the coast of California.

Which explain why San Fransisco has a relatively cool summer compared to the other states in USA

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4 years ago

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1. What are three examples of evidence that suggest that some continents were once joined and have since separated?

garik1379 [7]

Answer:

Fossils of the same species of land mammals have been found on separate land masses. Coal fields in the Americas and Europe share many similarities and it is highly possible that they were once connected to form a large coal field.

Explanation:

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3 years ago

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Which evolved during the paleozoic era?

Alexeev081 [22]

Fish, Arthropods, Amphibians, and Reptiles all evolved during the Paleozoic Era.

Hope this Helps!

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3 years ago

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If a star is able to stabilize after there is no more hydrogen in its core, then it is now fusing helium nuclei together in a re

avanturin [10]

Answer: The correct answer is Option b.

Explanation:

Nuclear fusion reaction is defined as the reaction in which lighter nuclei combine together to form a single heavier nuclei.

Another name for helium nuclei is alpha particle.

For the given options:

Option a: The CNO cycle

This cycle is named as carbon-nitrogen-oxygen cycle. In this cycle, carbon absorbs a proton to form nitrogen which further absorbs a photon to form oxygen. Thus, helium particles are not getting fused in this process.

Option b: The triple alpha process

This process is a set of nuclear reaction in which 3 alpha or helium nuclei combine together to form carbon nucleus.

The equation representing the fusion process follows:

$_2^4\textrm{He}+_2^4\textrm{He}\rightarrow _4^8\textrm{Be}+\gamma\\\\_4^8\textrm{Be}+_2^4\textrm{He}\rightarrow _6^{12}\textrm{C}+\gamma$

Option c: Photo dissociation

This is defined as the process in which a chemical compound is broken down by photons. Thus, helium particles are not getting fused in this process.

Option d: The proton-proton chain

This process is a set of nuclear fusion reactions by which stars convert hydrogen nucleus to helium nucleus. The chemical reactions for this process are:

$_1^1\textrm{H}+_1^1\textrm{H}\rightarrow _1^2\textrm{H}+_{+1}^0\textrm{e}+\text{energy}\\\\_1^2\textrm{H}+_1^1\textrm{H}\rightarrow _2^3\textrm{He}+\text{energy}\\\\_2^3\textrm{He}+_1^1\textrm{H}\rightarrow _2^4\textrm{He}+_{+1}^0\textrm{e}+\text{energy}$

Here, fusion of protons takes place.

Hence, the correct answer is Option b.

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4 years ago

Most often limits product availability for consumers.

Alex_Xolod [135]

C. Transportation limits product availability

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4 years ago