When plate tectonics cause cracks to form,

Final answer:

The slowest type of mass movement, often taking many years, is known as a creep; this process involves the gradual downhill movement of surface soil under gravity.

Explanation:

The slowest type of mass movement is known as a creep. This is a very slow, continuous process where the surface soil gradually moves downhill under the influence of gravity. Unlike in a slump, mudslide or rockfall, which occur more suddenly and rapidly, the movement in a creep is almost imperceptible and can take many years, even decades to noticeably affect the landscapes over large areas. The movement is so gradual that plants can often grow on the moving material, further obscuring the process.

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After two half-lives, there is no longer any of the original radioactive material remaining. Thus, the given statement is true.

What is the half-life of a radioactive isotope?

A radioactive isotope's half-life is the amount of time it takes for the number of nuclei in a sample to decrease by half. The Phanerozoic eon refers to the whole period of geologic time that preceded the start of the Paleozoic era. The isotope's mass number is unaffected by the emission of a beta particle. There is no longer any of the original radioactive material after two half-lives.

A half-life, or the amount of time it takes for half of a substance to decay radioactively, is what distinguishes natural radioactive processes. It is simple to determine how much material remains after a specific number of half-lives. For instance, the six-hour half-life of the aforementioned technetium-99m indicates that starting at 100 percent, after six hours, we can no longer detect it.

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Answer:

true

After two half-lives, there is no longer any of the original radioactive material remaining.

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Answer:

European descent

Explanation:

• White South African care of the south African descends and defined fir the white racial or ethnic groups of the Europe and ad they are generally divided as the dutch each India company as the original settlers and 57.9% were the African native speakers and the 42% are the native speakers.

• They belong to the Portuguese and the German and were the largest European descendant groups and have established a distinct, languages and  89% is the Christian faith.

Answer:

completely controlled the country’s resources

Explanation:

The white population possessed nearly all of the country’s wealth.