Answer:
Infrequent but highly explosive
Explanation:
At a subduction zone, the descending plate carries with it sediments containing water and carbon dioxide.
These substances are trapped as fluids at high pressure in the rising magma.
When they reach atmospheric pressure at the surface, they become gases that expand suddenly and explosively.
Answer:
50-64
Explanation:
China is the nation with the largest population in the world, and that has been the case throughout all of the written history, and probably even before that. The country had very large birthrates, which was leading to rapid growth to the population. Because of that, there was even a law that restricted the families as to how many children they can have. Because of that law, the population of China started to gradually age, so the percentage of the younger age groups has been declining, while the percentage of the older age groups has been on the rise. This has led to the age group of 50-64 to account for 120 million people in China, a percentage that has grown almost twice compared to several decades prior to that.
Answer:
Metal that has not yet been refined.
Explanation:
The mining companies are companies that are involved in the extraction of natural resources from the crust. They can operate on land or in water. The extraction of natural resources involves numerous things, such as oil, natural gas, and metals.
When it comes to the extraction of metals, the term that is used is ore. Ore refers to the metal that has still not been refined, or rather it is in its natural form and is not useable without manufacturing it. The extraction of ore is among the biggest businesses in the world, and many countries in the world have it as the number one or one of the top economic contributors.
The earth’s atmosphere is composed of (in order from lowest of highest);
- Troposphere
- Stratosphere
- Mesosphere
- Thermosphere
- Exosphere
The density of the molecules of air reduce with increase in altitude. Therefore the higher layers have low air density that those below them.
The exosphere (the outermost layer) extends to outer space and is composed of lighter gases such as helium, hydrogen, carbon dioxide and atomic oxygen.
The rest of the layers consist of molecular oxygen, atomic oxygen, molecule nitrogen, atomic nitrogen, and hydrogen.
The thermosphere has a temperature inversion – increase in temperatures with altitude. This is due to absorption of UV by the ozone layer; the highest ozone layers absorb most of the UV.
