The Landform Diagram Quiz

Uniformitarianism

A drawn cross-section of a landform that shows the layers that form it

Uniformitarianism, the law of original horizontally, the law of superposition, crosscutting relations, and unconformities

<p>The idea that the present is the key to the past, and that natural laws have remained the same throughout the history of the earth</p> Signup and view all the answers

<p>By showing the order of geologic events that created it and how it has changed over time</p> Signup and view all the answers

<p>In a sequence of undisturbed sedimentary rocks, the oldest rocks are at the bottom and the youngest rocks are at the top</p> Signup and view all the answers

<p>The law of original horizontality states that sedimentary rocks are originally formed in horizontal layers.</p> Signup and view all the answers

<p>The law of superposition states that in any undisturbed sequence of layers of rock, the oldest or first-deposited layer would be on the bottom and the youngest would be on the top.</p> Signup and view all the answers

<p>The principle of crosscutting relations states that any rock or fault that cuts across other rocks is younger than those it cuts across.</p> Signup and view all the answers

<p>Unconformities are surfaces of erosion that separate younger rocks from older ones.</p> Signup and view all the answers

<p>Unconformities can occur because of wind, water, or friction when other rocks scrape along them, like when a glacier slides over the landform.</p> Signup and view all the answers

<p>According to the law of original horizontality and the law of superposition, the layers of rock were laid down first, followed by the folding and bending of the layers.</p> Signup and view all the answers

<p>The main idea of geology is uniformitarianism, which states that the present is the key to the past, or that we can deduce what happened in the past by observing how things work today.</p> Signup and view all the answers

<p>The four key ideas are the law of original horizontality, the law of superposition, crosscutting relations, and unconformities.</p> Signup and view all the answers

<p>The law of original horizontality states that rock layers are originally deposited horizontally.</p> Signup and view all the answers

<p>The law of superposition states that in an undisturbed sequence of rock layers, the youngest rocks are on top and the oldest rocks are on the bottom.</p> Signup and view all the answers

<p>Crosscutting relations refer to the principle that a rock or geologic feature that cuts across another rock or feature is younger than the rock or feature it cuts across.</p> Signup and view all the answers

<p>An unconformity is a surface of erosion or non-deposition that represents a gap in the geologic record.</p> Signup and view all the answers

<p>The two reasons are that the tube of magma does not continue past the unconformity and that layers 6 and 7 are on top of the formation.</p> Signup and view all the answers

<p>The four key ideas help geologists determine events that have occurred long ago and develop some ideas about the order of events that helped shape our landscape.</p> Signup and view all the answers