Answer: 1- (D)
2- Lithosphere
3- True
4- True
Explanation: Black smokers are generated in the mid oceanic ridges and during the underwater volcanic eruption, which is a hot vent releasing black colored smokes of sulfur from it. They are often associated with the Volcanogenic Massive Sulfide (VMS) deposits.
The lithosphere is the rigid broken plates that are relatively cool and flows over the weaker and viscous asthenosphere layer.
When the groundwater flow intersects the ground level, it forces the water to come out to the surface forming a spring.
The study of changing atmospheric composition along with the ice cores, helps in determing the age upto 800,000 years. But recently, a new discovery has made, in which the ice cores helped in dating back to about 1.5 million years.
Answer:
B option is correct of course!!
The countries in European Union are linked as they have a single common currency and they allow people to move easily between the countries.
Option C and D
<h3><u>Explanation:
</u></h3>
Only one market system was established by The European Union. It has been established in all its territories and has about 513 millions. Since there do not exists any differences in the currency it helped trading a lot. EU is the world's largest exporter.
Euro is used as a common currency. This is under Eurozone, which is the Monetary union. The number of states joined this union is 19. This union has 342 million EU citizens as its member. After the US dollar, Euro is the currency that is used in trading among different countries and it hold the second position in the reserve currency list. The countries under European Union allow people to move from one country to another. They can study in one country and work in some other country of European Union.
A. 500,000 indigenous people living in Brazil.
