12. According to the law of conservation of

What causes magnetic striping noticed about mid ocean ridges?

Bezzdna [24]

Magnetic Striping

The confirmation of the theory of plate tectonics relies on key insights and scientific experimentation. One of these is the knowledge of the magnetic properties of ocean crust.Early in the 20th century, Bernard Brunhes in France and Motonari Matuyama in Japan recognized that rocks generally belong to two groups based on their magnetic properties. One group known as normal polarity has within its mineral composition a polarity similar to the Earth’s magnetic north. The magnetic properties of the other group, called reversed polarity, is the opposite of the Earth’s present day magnetic field. The reason, tiny grains of magnetite found within the volcanic basalt that make up the ocean floor behave like little magnets. These grains of magnetite can align themselves with orientation of the Earth’s magnetic field. How? As magma cools, it locks in a recording of the Earth’s magnetic orientation or polarity at the time of fooling. The Earth’s magnetic field is similar to the field generated by a bar magnet with its north end nearly aligned with the geographic North Pole. Yet the Earth’s field is the result of a more complex, dynamic process: the rotation of the planet’s fluid iron rich core. Scientists have known for centuries that the Earth’s magnetic field is dynamic and evolving. The magnetic field drifts slowly westward at a rate of 0.2 degrees per year. However, over tens of thousands of years, this field undergoes far more dramatic changes known as magnetic reversals. During this reversal, south becomes north and north south apparently in a geological blink of an eye – perhaps over a period of a few thousands years. What these reversals recorded were stripes on seafloor maps-- stripes of alternating normal and reversed polarities of ocean crust. These “stripes” formed the pattern known as magnetic striping.The ocean floor had a story to tell. That story would unfold in the work of three scientists. In 1962, two British scientists, Frederick Vine and Drummond Mathews, and Canadian geologist Lawrence Morley working independently suspected that this pattern was no accident. They hypothesized that the magnetic striping was produced from the generation of magma at mid-ocean ridges during alternating periods of normal and reversed magnetism by the magnetic reversals of the Earth’s magnetic field.

7 0

3 years ago

Why can only sperm fertilize an egg?

Svetlanka [38]

Answer:

Sperm is the only thing that can combine with a egg to create a living breathing organism

Explanation:

5 0

3 years ago

What will occur if a species is divided into two groups and allowed to reproduce in different environments for many generations?

bonufazy [111]

Answer:

The original species will diverge into two new species. It will occur speciation. It will occur some sort of allopatric speciation.

Explanation:

When the original species is divided and placed under different environments, where they can reproduce for many generations, many changes or mutations will occur in each group. These changes will depend on each group´s environment and its ecological pressures and will lead to divergence. Pressures act on individuals and make them adapt to the new environmental conditions. Generation after generation, the genotype of individuals will increase the fitness to survive and reproduce. The fixation of mutations will increase the difference among both groups, up to the diverging point into two new species.

The biological concept of species states that individuals of the same species can reproduce because they have a genetic reservoir in common: many genetic variants.

Genetic variability is the measure of a species organism´s tendency to differentiate. In genetic variability, individuals of the same species are not identical. They are recognizable as members of the same species, but they differ in shape, function, and behavior. There exist variations among individuals of the same species.

Genetic variability originates from mutations, recombinations, and karyotype alterations. It allows or makes possible evolution.

Allopatric speciation consists of the geographic separation of a continuous genetic background giving place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flux, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.

The process of allopatric speciation involves different steps:

• The emergence of the barrier.

• Interruption in the genetic interchange

• The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.

• Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.

• Prezigotic isolation mechanisms favored by selection once occurs a secondary contact between the new species in formation.

6 0

3 years ago

Which organelle is responsible for actually making proteins?

yuradex [85]

Ribosomes
Ribosomes and Endoplasmic Reticulum
Ribosomes are the organelles responsible for protein translation and are composed of ribosomal RNA (rRNA) and proteins. Some ribosomes are found in the cytoplasm, a gel-like substance that organelles float in and some are found in the rough endoplasmic reticulum.
Hope this helped.

4 0

3 years ago

To see if the pearls are shiny because

Volgvan

Hiiihhdjhdhdjsjsjaisjjsjdjdjd

6 0

3 years ago