Q. When rocks are changed through heat and squeezing they become?
Metamorphic rocks start off as igneous, sedimentary, or other metamorphic rocks. These rocks are changed when heat or pressure alters the existing rock’s physical or chemical make up. One ways rocks may change during metamorphism is by rearrangement of their mineral crystals.
Q. When rocks get pushed down into the earth?
When rocks are pushed deep enough down into the Earth, they can melt to form molten rock. Below the surface of the Earth, molten rock is called magma but when erupted above the ground, usually through volcanoes, it is called lava.
Q. What happens to rocks when they are pushed down in the crust with new layers of dirt?
This process is called compaction. As the sediment layers are being compacted, the sediments begin to stick together and become cemented by clay or minerals like silica and calcite. Finally, after the rock particles are compacted and cemented into layers, they become a sedimentary rock.
Q. What happens to rocks as it pushed aside after millions of years?
The rocks are gradually recycled over millions of years. This is called the rock cycle . For example, sedimentary rocks can be changed into metamorphic rocks. These can be weathered, eroded, and the pieces transported away.
Q. What causes rock layers to squeeze together and push upwards?
– three most common types of mountains are: 1. folded mountains (pg. 116) – these form when rock layers are squeezed together & pushed upward.
Q. Under what set of conditions is a rock most likely to break rather than bend?
At the Earth’s surface, rocks usually break quite quickly, but deeper in the crust, where temperatures and pressures are higher, rocks are more likely to deform plastically. Sudden stress such as a hit with a hammer, is more likely to make a rock break. Stress applied over time often leads to plastic deformation. 2.
Q. What is it called when rocks are squeezed together causing rocks to break the tectonic stress?
Compression. The type of stress that occurs when an object is squeezed, as when two tectonic plates collide. Tension.
Q. How does compressional force change a rock body?
How will compressional force change a rock body? Shorten and thicken the rock. You just studied 27 terms!
Q. When rocks return to their original shape after being strained we call it?
Figure 12.3 Elastic deformation, rupture, and elastic rebound. Top: Stress applied to a rock causes it to deform by stretching. When the stress becomes too much for the rock, it ruptures, forming a fault. The rock snaps back to its original shape in a process called elastic rebound.
Q. How do you know if a fault is active or not?
A fault that is likely to have another earthquake sometime in the future. Faults are commonly considered to be active if they have moved one or more times in the last 10,000 years.
Q. What will be released when the rocks suddenly snap?
Sudden motions along faults cause rocks to break and move suddenly, releasing the stored up stress energy to create an earthquake. A slip is the distance rocks move along a fault and can be up or down the fault plane.
Q. Where are there no earthquakes?
Is there any place in the world that doesn’t have earthquakes? Florida and North Dakota are the states with the fewest earthquakes. Antarctica has the least earthquakes of any continent, but small earthquakes can occur anywhere in the World.
Q. Do earthquakes happen more in the summer or winter?
Philippe Avouac of Caltech and his colleagues analyzed a catalog of 10,000 Himalayan quakes and found there were twice as many during the winter months (December to February) as during the summer. For example, for magnitude-3 quakes, there were up to 150 per month in the winter, but only 75 in the summer.
Q. What time of year earthquakes occur?
A glance at geologic statistics might lead one to believe March is earthquake month. After all, the two strongest recorded earthquakes in U.S. history occurred in this month.
Q. What does a 7.0 earthquake feel like?
A large earthquake far away will feel like a gentle bump followed several seconds later by stronger rolling shaking that may feel like sharp shaking for a little while. A small earthquake nearby will feel like a small sharp jolt followed by a few stronger sharp shakes that pass quickly.
Q. What’s the longest an earthquake can last?
This is because the fault rupture spreads very quickly, so the whole process of faulting is over very quickly. During the very largest earthquakes, fault rupture can continue for up to 5 minutes as the rupture spreads over a length of say 1000km.
