Groundwater
erodes rock beneath the ground surface. Limestone is a carbonate and is most easily eroded. Groundwater dissolves minerals and carries the ions in solution. Groundwater erosion creates caves and sinkholes.
How are sinkholes formed?
Sinkholes are formed
when the land surface above collapses or sinks into the cavities or when surface material is carried downward into the voids
. Drought, along with resulting high groundwater withdrawals, can make conditions favorable for sinkholes to form.
Why did these caverns and sinkholes form?
Why did these caverns and sinkholes form?
The bedrock chemically reacted with acidic groundwater
. This type of bedrock contained large amounts of oxygen and silicon. Glacial deposits altered the shape of the bedrock.
Which two factors most likely caused this landslide?
Bottom line: Landslides are mainly caused by gravity acting on weakened rocks and soil that make up a sloping area of land. Both natural and human-related activities can increase the risk for landslides.
Water from heavy rainfall
is a frequent trigger for landslides.
Which rock layers appear to have weathered and eroded most?
| Question Answer | which rock layers appear to have weathered and eroded most 1.Irondequoit limestone and Whirlpool sandstone 2. Power Glen shale and Queenston Shale 3.Lockport dolostone and Reynales limestone 4.Thorold sandstone and Rochester Shale. 2 is the answer |
|---|
What happens if you fall in a sinkhole?
The vegetation might wilt and die
due to the sinkhole draining away water. If you notice these signs, find out if you live in an area that’s susceptible to sinkholes. Ask a geologist or soil engineer if your house is at risk. If it is, a professional can inject grout into the hole to reinforce the foundation.
What are the 4 types of sinkholes?
- Collapse sinkholes. This occurs in areas where there is extensive cover materials over a limestone layer. …
- Solution Sinkholes. …
- Alluvial Sinkholes. …
- Raveling sinkholes.
What is the difference between a cave and a sinkhole?
Caverns and Sinkholes
Once in the ground, this water either stays there for a very long time or it discharges into streams and
rivers
, keeping them flowing smoothly. … Sinkholes are funnel-shaped holes in the ground, and caverns are large open spaces underground.
What is at the bottom of a sinkhole?
Credit: Ann Tihansky, USGS, Public domain. Sinkholes are common where the rock below the land surface is
limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them
. As the rock dissolves, spaces and caverns develop underground.
What is the largest sinkhole in the world?
Xiaozhai Tiankeng
– the deepest sinkhole in the world (over 2,100 feet), located in Fenjie Count of Chongqing Municipality.
Which two locations have the greatest stream velocities?
Stream Processes. Stream velocity is the speed of the water in the stream. Units are distance per time (e.g., meters per second or feet per second). Stream velocity is greatest
in midstream near the surface
and is slowest along the stream bed and banks due to friction.
What is the main factor that causes the bedrock?
The processes of weathering and erosion
affect bedrock. Outcrops exposed to wind and water are often decomposed, or weathered, over time into regolith or smaller particles.
Which event is the best example of erosion?
Some of the most famous examples of erosion include
the Grand Canyon
, which was worn away over the course of tens of millions of years by the Colorado River with the help of winds whipping through the formed canyon; the Rocky Mountains in Colorado have also been the subject of intense geological study, with some …
Which rock layer is probably the most resistant to erosion?
Igneous rocks
are usually solid and are more resistant to weathering. Intrusive igneous rocks weather slowly because it is hard for water to penetrate them. Sedimentary rocks usually weather more easily. For example, limestone dissolves in weak acids like rainwater.
At which location is the water moving fastest?
1.
Toward the middle of a river
, water tends to flow fastest; toward the margins of the river it tends to flow slowest. 2. In a meandering river, water will tend to flow fastest along the outside bend of a meander, and slowest on the inside bend.
What type of rock is most resistant to weathering?
Quartz
is known to be the most resistant rock- forming mineral during surface weathering.
