<span> Rocks weaken with depth and then get stronger deep in the crust. Rocks systematically get stronger from the surface to deep in the crust.</span><span>
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Answer:
geomagnetic field.
Explanation:
The earth magnetic field can be likened to a bar magnet with a North and South pole. It originates from the movement of molten iron and nickel in the outer core.
At every point in time, the magnetic field orientation can change. We must note that the magnetic north lies close to that of geographic north axis of the earth.
Around the mid-oceanic ridges, new materials are brought to the surface. These new materials can contain magnetic minerals such as haematite which are capable of being magnetized as a result of the prevalent magnetic field of the earth. As different materials are brought up, the magnetic minerals preserves the details of the magnetic field at that point in time. Using this information can know the orientation of the magnetic field at any point in time if the magnetic history chart of the earth is constructed. Oceanic ridges becomes older as they move away from the divergent margins.
Answer:
The costs of non-sovereignty are high.
European countries are increasingly vulnerable to external pressure that prevents them from exercising their sovereignty. This vulnerability threatens the European Union’s security, economic health, and diplomatic freedom of action, allowing other powers to impose their preferences on it.
To prosper and maintain their independence in a world of geopolitical competition, Europeans must address the interlinked security and economic challenges other powerful states present – without withdrawing their support for a rules-based order and the transatlantic alliance. This means creating a new idea of “strategic sovereignty”, as well as establishing institutions and empowering individuals that see strategic sovereignty as part of their identity and in their own interest. Most fundamentally, the EU needs to learn to think like a geopolitical power.
Out of all 7 areas, it's #5.
Out of 1, 2, 3, or 4, it's #4.
