Quarter 1- short ansewr Flashcards
What makes some sediments rounded and some sediments angular?
as sediments are transported, the particles collide with each other and other objects in their path which causes them to change size and shape.
when particles first break from their source rock they usually are angular and uneven
when particles traveled long distances they tend to be more rounded and smooth
Explain how the contour lines indicate the direction of flow of Downer Creek.
when a contour line crosses a stream or river it creates a v shape that points to the uper elevation where the water is coming from
List two of the chemical elements found in quartz.
silicon and oxygen
Describe two physical properties of quartz.
hardness of 7, fracture
How does diamond formation differ from graphite formation?
graphite forms closer to the surface and has fewer bonds than dimond.
Describe the texture shown by a metamorphic rock that indicates it could be marble.
non-foliated
Describe what causes a vesicular texture in some of the volcanic rocks.
when magma contains latge amounts of of dissolved gass and cools rapidly, the gases become
trapped as bubbles in the rock that forms
What are the characteristics of a plutonic igneous rock?
usually course grained and non vesicular
How does mineral composition affect rock color?
lite colored minerals result in light colored rocks
dark colored minerals result in dark colored rocks
The igneous rock basalt is sometimes sold as “black granite.” Compared to the density and composition of granite, describe how the density and composition of basalt are different.
basalt has a higher density
basalt is mafic and granite is felsic
Identify the environment of formation of pegmatite compared to volcanic glass.
intrusive, plutonic environmrnt
