A. Earth's magnetic field reverses over time; the changes show that seafloor spreading has taken place over time.
Explanation:
The pattern of the magnetic minerals in seafloor ridges are aligned in a repeating pattern because the earth's magnetic field reverses overtime.
This provides evidence because the changes shows that the sea floor spreading has taken place over time.
- The concept of sea floor spreading was first suggested by Harry Hess in the early 1960's.
- Using sophisticated tools, he was able to discover stripe patterns of magnetic minerals in rocks.
- The earth can be likened to a giant bar magnet
- The geomagnetic field originates from the core where the movement of molten metals induces magnetism.
- In a fresh cooling magma, the metallic minerals are able to align their domains with the prevailing magnetic field.
- At some point the magnetic field is normal with a very strong intensity. At other times the intensity is low and it reverses.
- The minerals keeps track of the changes.
- This leads to striped pattern that has been used to suggest sea floor spreading.
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Could you give me your answers so that I can better answer the question?
Answer:
The forestry department is using a<u> 1. </u><em><u>chemical method</u></em><u>.</u> This involves using a 2. <em><u>foliar spray</u></em> method, in which department personnel will spray directly on trees' leaves.
Explanation:
- White pine blister is a fungal disease of plant caused by fungus <em>Cronartium ribicola.</em>
- This fungus infects the plant through the stomata of the leaves.
- There are several methods of controlling pests and pathogen in agriculture which include ; mechanical methods; chemical methods and Biological methods.
- Mechanical methods include constructing barriers, electrical fencing etc.
- The biological method include introduction of organisms that will suppress pathogen activity.
- Chemical methods include use of pesticides , that are poisonous chemical substance that will kill the pathogen.
- Here the forestry department decides to spray insecticides thus, they are using a chemical method.
- Secondly they are going to spray the insecticide on each leaf so they have chosen the method of foliar spray and not the cut stump treatment or basal bark method.
From left to right.
1) Cytokinesis is almost
finishesd, so it’s the end of Telophase
2) The chromatids have just
split up and are migrating to each pole, so it’s Anaphase
3) All chromosomes are in the
equatorial plane, so it’s the end of Metaphase
4) The chromosomes are in the
poles and cytokinesis has just started, so it’s the beginning of Telophase
5) The spindle apparatus is
complete and the chromosomes are moving to the equatorial plate, so it’s the
beginning of Metaphase
6) The spindle apparatus is forming,
so it’s Prophase
If you want to put them in
chronological order, it’s like this:
6-5-3-2-4-1
The sodium and potassium ions are transported using a sodium potassium pump the process of moving sodium and potassium ions across the cell membrane.
