Based on the knowledge about radioactive elements, the decay of radioactive elements such as uranium creates heat especially in Earth's crust, where these elements are abundant.
<h3>What are radioactive elements?</h3>
Radioactive elements are elements which undergo spontaneous decay of their nucleus and in the process produce elements with smaller atomic masses with the release of radiation and heat.
Examples of radioactive elements include uranium and radium.
Therefore, the decay of radioactive elements such as uranium creates heat especially in Earth's crust, where these elements are abundant.
Learn more about radioactive elements at: brainly.com/question/18640165
Answer:
3 Countries with Petroleum
<em>1. Iran</em>
<em>2. Iraq</em>
<em>3. Kuwait</em>
3 Countries with Gold
<em>1. China</em>
<em>2. Russia</em>
<em>3. Australia</em>
Explanation:
1. Iraq's petroleum industry is very important for its economy. Before its <em>international embargo,</em> it became a major exporter of crude oil.
2. Iran has one of the largest petroleum reserves in the world. Just like Iraq, it also became a major exporter of crude oil. However, due to wars and sanctions, export revenue declined.
3. Kuwait is a tiny country that is <em>rich in oil.</em> It's largest industry is<em> "petroleum industry," </em>and it is owned by the government.
4. China is considered to be the<em> largest gold-producer in the world</em>. Although it only has a few gold reserves, many people are into <em>gold-mining.</em>
5. Next to China is Russia. It is second when it comes to the accumulation of gold, yet it is only in<em> 6th position</em> when it comes to gold reserve.
6. Australia is perceived to overtake China's position in the coming years as the largest producer of gold in the world. This is because of Australia's<em> cost-effective mining </em>and<u> plans for major expansion.</u>
Differences between the Troposphere and the Stratosphere:
The troposphere is the lowest level of the atmosphere, so it is in contact with the Earth’s surface. In contrast, the stratosphere is located above the troposphere, so it is not in contact with the Earth’s surface. Humans live in the troposphere, not the stratosphere. People only spend time in the stratosphere is when they are traveling through it on an airplane, or flying through it while riding in a rocket. The air density and air pressure are much lower in the stratosphere. In fact, stratospheric air is too thin for people to be able to survive without pressurized air to breathe.
Answer :A
“As a cold front moves into an area, the heavier (more dense) cool air pushes under the lighter (less dense) warm air, causing it to rise up into the troposphere. ... As the cold front passes, winds become gusty. There is a sudden drop in temperature, and also heavy rain, sometimes with hail, thunder, and lightning.”
