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schepotkina [342]
2 years ago
13

Early scientific attempts at determining Earth's age gave a number that was ______. Multiple choice question.

Geography
1 answer:
liubo4ka [24]2 years ago
8 0

Early scientific attempts st determining Earth's age gave a number that was around 4.6 billion years old.

<h3>Radiometric dating methods</h3>

The age of rocks can be most determined by radiometric dating.

This process of radiometric dating makes use of two different isotopes of a sample.

It is known that Radioactive isotopes break down within a known amount of time and this enables geologists to determine the age of a sample with the aid of equipment like thermal ionization mass spectrometer.

Learn more about Radiometric dating at

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Answer and Explanation:

1. Natural resources are those things which are found on the Earth without human exertion and they are of two kinds which are as per the following:

Renewable natural resources  :

It is a sort of natural resource which can be utilized over and over and they are not going to end sometime in the not so distant future, for instance, wind, sunlight based vitality, water, plants, etc.

Non-renewable natural resource  :

It is a sort of natural resources which are present in very limited quantity and it will end on someday, for example, Coal, petroleum, minerals, etc.

2. Human beings are mostly depended on natural resources and it makes their life easy and comfortable. Let's see its usages one by one.

Historical: Historically, we depended on the renewable natural resources, for example, plants, animals, water and our life started and ended with this form of natural resources when we were not technically advanced.

Present: Presently, we are more technologically advanced and using various technologies to lead our life and we are using fossil fuels at a greater extent and within 30 to 50 years this non-renewable source is going to end and we need to choose our alternative ways also.

Future potential: The way non-renewable natural resources are declining by our present use, we need to switch to renewable sources which are long lasting as well as eco-friendly and that's why the renewable natural sources would be in more demand in near future.

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The populations of lot of amphibians, with rare exceptions, are constantly on the decline around the world. The main reason behind this is the human activity, as it has caused lot of changes, pollution, and dangers for the amphibian populations, which has led lot of amphibians to be on the verge of extinction.

The pollution, especially of the waters, has been a major factor for the decline of the amphibian population. Lot of very toxic chemicals have made the water unsuitable for living and poisonous, which systematically killed off the amphibian populations.

The habitat loss, as with any other group of animals, has left the amphibians without places to live. They have been left without their shelters, food sources, mating grounds, and they have started to die out.

The invasive species, especially the predatory ones, have also had big negative impact. The amphibians didn't had any defense mechanism against the introduced predators, so they were easy prey and their numbers rapidly went down.

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