Answer:
After three half-lives, it is 7:1
Explanation:
- The rate at which the decay of the radioactive isotope is said to be half-life and is represented as the half-life of the atoms and the matter to disintegrate itself.
- The two radioactive isotopes are K 40 and Ar 40. After the K-Ar dating, they contain minerals such as the clay mica and the temphra minerals and Half-life of the K 40 is 1.3 more than 100,000 years i.e 10x9 years for Ar 40.
- <u>Thus the K 40 has to divide as three half-lives have passed if the ratio of argon to potassium atoms is 7:1. At the end of one half-life, the ratio of the number of argon to potassium atoms is 1:1. and two half lives its 3:1 thus after the third half-life it becomes as 7:1.</u>
South American and Nazca tectonic plate boundary;
The boundary between the South American and the Nazca plates is a vibrant one. These two plates have the same density, so they collide and lift the land upwards, which is why the Andean Mountain Range formed. Occasionally there are earthquakes and they can be very strong. This is a convergent boundary.
Indian and Eurasian tectonic plate boundary;
The tectonic between the Indian and the Eurasian tectonic plates is also a convergent one, where we have two tectonic plates with the same density pushing against each other, and thus lifting up the land, which is how the Himalayan Mountain Range was formed. The earthquakes are relatively rare, and are of different velocity.
Pacific and North American tectonic boundary;
The border between these two plates is a a convergent one as well, but the Pacific plate has a smaller density than the North American one, so it is subducting underneath it. This brings in a very big geological activity, so there's multiple volcanoes and volcanic activities, as well as a big amount of earthquakes.
Answer:
Poor recycling habits - recycling is a very important activity for sustainable development, because it reduces the amount of goods that have to be produced, and it contributes to the dematerialization of the economy. If a family does not recycle properly, or does not recycle at all, that family is hindering sustainable development.
Showers that are too long - very long showers do not help sustainable development because they are a waste of water. If the shower is warm or hot, the problem is worse because there is also excessive consumption of electricity or gas.
Too much use of heating or air conditioning - air conditioning and heating should only be used when absolutely necessary (when it is too hot or too cold). If these two systems are used without care, a huge amount of energy will be used, which will not only be reflected in the utility bill, but also in the Earth's resources.
Answer:
Red
Explanation:
On the provided map the semi-arid climate areas are colored red. More than half of New South Wales has this kind of climate. Semi-arid climates usually get about double the rain than desert regions. There are two distinct classifications of semi-arid climates and these are hot and cold. These are sometimes also called steppe climates.
