Answer:
c) known to have experienced numerous polarity reversals, as seen by the remnant magnetization of iron-rich minerals in rocks.
Explanation:
Paleomagnetism is the study of the Earth's magnetic fields in sediment (rocks or other archaeological material). This can be used to estimate the age of sediment (or in this case, the seafloor) because it is known that the magnetic field of Earth experienced numerous polarity reversals. This allows is to employ such sequences as a chronologic tool. Paleomagnetism has also been a significant tool in the subjects of continental drift and plate tectonics.
Answer:
When plates move away from each other, the space between them gets filled with material, which rises to the surface, cools and forms mid-oceanic ridges. The Pacific Ocean is growing wider by about 18 cm per year as the plates diverge and the mid-oceanic ridge is built up. Where plates come into contact, energy is released. Plates sliding past each other cause friction and heat. Subducting plates melt into the mantle, and diverging plates create new crust material. Subducting plates, where one tectonic plate is being driven under another, are associated with volcanoes and earthquakes.
When Alfred Wegener first proposed the idea of continental drift (the precursor idea to plate tectonic theory), it didn’t quite explain the full story. While he correctly showed that Africa and South America fitted together, his model wasn’t able to explain the violent forces that occur around the Earth’s crust. It wasn’t until the 1960s that a full explanation began to develop – the theory of plate tectonics.
Explanation:
Geography is a mix of studying humans and the natural environment. Geography can help people to understand the bedrock and soil that buildings can be built on. It can help identify areas they are prone to natural disaster, such as flooding and landslides. By studying previous urban areas geography can show use the mistakes made in the past and how to prepare for the future with problems such as preventing traffic congestion. Understanding differ countries and cultures will also for a more diverse community to prosper in a time of globalization.
6,371 kilometers or 3,958 miles.
