What are 5 ways that the order of rock layers can be disturbed?
Folding, tilting, faults, intrusions, and unconformities all disturb rock layers. Sometimes, a single rock body may have been disturbed many times. Geologists must use their knowledge of the things that disturb rock layers to piece together the Earth’s history.
What does it mean if you find Bent rock layers?
Rocks deforming plastically under compressive stresses crumple into folds. They do not return to their original shape. If the rocks experience more stress, they may undergo more folding or even fracture. A monocline is a simple bend in the rock layers so that they are no longer horizontal.
Which principle of relative dating did you apply to determine whether rock layer H is older or younger than layer?
superposition
Why are some rock layers missing from the sequence in some outcrops?
193 Page 4 DISCUSSION QUESTIONS: (Answer in Conpleie Sentences) 1. Explain why some rock layers can be missing from the sequence in some outcrops. They were weathered and eroded or never deposited. reconstruct a sequence of events?
How an older rock layer would appear on top of a younger rock layer?
downstream to the riverbed. However, the most common mechanism to produce older rocks on top of younger is by thrust faulting. Thrust faults form where rocks are being compressed, usually by plate tectonic mechanisms. Thrust faults rip up older strata and pile it on top of younger rocks.
How did geologists determine the sequence of stratified rocks?
Answer: There are two methods of determining the ages of rocks: relative dating and absolute dating. Relative dating is a method of arranging geological events based on the rock sequence. Absolute dating is a method that gives an actual date of the rock or period of an event.
Which type of rock is often associated with stratified rocks?
Sedimentary Rocks
What do you think is the importance of studying stratified rocks to geology?
Answer: It is important in the interpretation of the Earth’s history because it indicates the relative age of the rock layers and fossils. The law of original horizontality states that most sediments were originally laid down horizontally. However, many layered rocks are no longer horizontal.
What do you think is the importance of studying the age of rock?
Gaining estimates of ages of rocks is crucial for establishing not only the history of geological events but also for determining the rates of geological processes. It is possible to establish the relative order of events in some rocks.
How it will affect the rock layers mining?
Answer: The change in overburden structure resulting from mining causes horizontal tension on the surface, while vertical shear occurs due to the movement of overburden in the vertical direction.
What is the importance of stratified rocks in history?
It is important in the interpretation of the Earth’s history because it indicates the relative age of the rock layers and fossils. The law of original horizontality states that most sediments were originally laid down horizontally. However, many layered rocks are no longer horizontal.
Are the non layered rocks considered as stratified rocks?
Answer: This layering of sedimentary rocks is referred to as stratification, the layering that occurs in most sedimentary rocks and in those igneous rocks formed at the Earth’s surface,as from lava flows and volcanic fragmental deposits.
Where does the oldest rock found?
That’s right, geologists, Canada is home to the world’s oldest discovered rocks! When the Earth was formed about 4.6 billion years ago, the molten rock on the surface hardened to form a solid crust.
What does the thickness of each rock layer indicate?
Thickness in geology and mining refers to the distance across a packet of rock, whether it be a facies, stratum, bed, seam, lode etc. The concept of thickness came originally from mining language, where it was used mainly to indicate the workability of seams.
What is the thickest sedimentary layer?
On the seafloor, sediments are thinnest near spreading centers (young seafloor) and thicker away from the ridge, where the seafloor is older and has more time to accumulate. – Sediment layers are thickest near the continents, the source of lithogenous material, and thinner farther out to sea.
What can be concluded if a dike protrudes through several layers of rock?
radioactivity