Please help me with these questions I have looked all threw my book but i cant find them.
7. Why are we not sure about the interior of the earth? Do we know for sure why?
12. Some volcanoes are more explosive than others? What makes this diffrence in explosivity occur?
14.What is the elastic rebound theory? Why do fences off set during an earthquake?
Please help me I am getting a headache from looking so much.
I found some info on wikipedia about this subject(just google for volcano+wikipedia)
Basically, the explosive power of a volcano depends on the composition of its magma. If the magma contains high amounts of silica (>63%), gases are trapped within, and cause enormous explosions. Other volcanoes containing less silically will tend to be far less destructive.
We are not sure of the core because we havent dug that far but we due know there is magna and copper I think, some mat. We also know it has a little grvitation pull holding us to earth
I hope this helps you I also am doing biology homework and cannot figure out this probability I know its easy I just need some one to refresh my memory I ahve all the #'s I need to plug in just staring at me giving me a head ache o wel GL
I'm here to help you find the answers to your questions! Let's tackle them one by one:
7. Why are we not sure about the interior of the earth? Do we know for sure why?
To answer this question, we rely on scientific methods and principles. One of the main reasons why we are not entirely sure about the interior of the Earth is that we cannot directly observe it. The Earth's crust, the outermost layer, is accessible to human exploration, but the interior is beyond our reach. Therefore, scientists study seismic waves, the behavior of rocks, and other indirect evidence to infer the Earth's internal structure. While we have made significant progress in understanding the interior, it still remains a subject of ongoing research and exploration.
To find more information on this topic, you can consult your textbook's sections related to seismology, Earth's internal structure, plate tectonics, or geophysics. Look for keywords such as "Earth's interior" or "seismic waves."
12. Some volcanoes are more explosive than others? What makes this difference in explosivity occur?
The explosivity of a volcano depends on various factors. One crucial factor is the type of magma erupted. Magma can be broadly classified into two types: basaltic and andesitic/rhyolitic. Basaltic magma, which is less viscous, tends to produce less explosive eruptions, with lava flowing more freely. On the other hand, andesitic/rhyolitic magma is more viscous and can lead to explosive eruptions.
Another important factor is the presence of gas in the magma. As magma rises toward the surface, the decrease in pressure causes gas bubbles to expand. If the magma contains a significant amount of gas, these expanding bubbles can lead to explosive eruptions.
Additionally, the shape of the volcano's vent plays a role. Some volcanoes have a steep-sided crater, which can trap gas and build up pressure, leading to explosive eruptions.
To obtain more detailed information on this topic, you can refer to the chapters or sections in your book related to volcanoes, volcanic eruptions, magma types, or volcanic hazards.
14. What is the elastic rebound theory? Why do fences offset during an earthquake?
The elastic rebound theory helps explain how energy is released during an earthquake. According to this theory, the Earth's crust is constantly under stress and deformed due to the movement of tectonic plates. Eventually, the stress accumulates to a point where the rocks along a fault line rupture, releasing stored energy in the form of seismic waves. This sudden release of energy causes the ground to shake, resulting in an earthquake.
During an earthquake, the rocks on either side of a fault remain locked as the stress builds up. However, once the stress exceeds the strength of the rocks, they break and move, releasing the accumulated energy. This sudden movement and release of stress cause the ground to shake, resulting in an earthquake.
As for the question about fences offsetting during an earthquake, it is because different parts of the ground move in different directions due to the movement along the fault. The displacement or movement of the ground can cause linear features like fences to be offset, resulting in misalignment or displacement.
To find more information on the elastic rebound theory and earthquakes, you can check your textbook's chapters on plate tectonics, faults, seismic activity, or earthquake causes and effects.
Remember, it's important to thoroughly read your textbook and look for relevant sections or chapters that discuss the topics related to your questions. Additionally, you can search online resources or consult your teacher or classmates for further explanations or study materials.