Biology, 16.10.2019 01:30 changav36832

As the seafloor spreads at an ocean ridge, basalts become normally or reversed magnetized depending on at the time of their cooling.
• the age of the crust
• the temperature of the water
• the spreading rate
•the orientation of the magnetic field

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Answer from: zakarycrane9576

The orientation of the magnetic field

Explanation:

The earth's magnetic field is a region of magnetic force surrounding the earth. It is widely accepted that it originates from the motion of iron and nickel in the outer core.

The magnetic field of our earth has both North and South Pole. The North Pole is around the geographic north while the South Pole lies very close to the Geographic South.

From careful studies of sedimentary rocks and some igneous rocks, it has been observed that there has been changes in the magnetic field directions through geologic time. This change is based on the strength of the magnetic field.

We have a normal polarity when magnetic lines of force leaves the South and enters the North and it is reversed when the direction changes.

Some magnetic minerals like magnetite in rocks would align their magnetic domains as they crystallise out of magma to the prevailing magnetic field of the earth. When the Curie temperature is reached, the alignment stops and the domains have been aligned.

For a magma that crystallise when the polarity was normal, the magnetic minerals will bear the records. When the polarity reverses in the presence of crystallising magnetic minerals, the record is also taken.

Answer from: Quest

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of amino acids , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in genes . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called transcription ), and the mrna is transported to the ribosome . protein synthesis, also called translation , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the nucleotides of mrna three by three, in units called codons , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the amino acid chain goes on to be processed and folded to make the final, functional protein

Answer from: Quest

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As the seafloor spreads at an ocean ridge, basalts become normally or reversed magnetized depending...

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