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Chapter 7 Mountains and Hills Pg 144. Quiz 7a  ________ is the variety of elevation's and arrangement of land forms.  _______is made of lighter, less-dense.

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Presentation on theme: "Chapter 7 Mountains and Hills Pg 144. Quiz 7a  ________ is the variety of elevation's and arrangement of land forms.  _______is made of lighter, less-dense."— Presentation transcript:

1 Chapter 7 Mountains and Hills Pg 144

2 Quiz 7a  ________ is the variety of elevation's and arrangement of land forms.  _______is made of lighter, less-dense rocks and is generally much thicker.  _________is thinner and more dense than continental crust  ______________A natural elevation of the earth’s surface rising into a summit.  __________The shapes of the structures on the earth’s surface is known as  Mountainous areas have__________, while plains and plateaus have__________________.  Name two types of landforms____________________

3 7A What is a Mountain?  Topography - is the variety of elevation's and arrangement of land forms.  Basins are formed when oceanic crust sinks into the mantle.  7qhUQZg 7qhUQZg

4  Continental crust is made of lighter, less- dense rocks and is generally much thicker it rises higher above sea level and makes the land we walk on.  Oceanic crust is thinner and more dense than continental crust. This crust produces the ocean floor.  Isostasy- describes the balance of the weights of rock, water, and ice and the upward force of the mantle

5 Landforms and Orogeny  The shapes of the structures on the earth’s surface is known as landforms  Landforms include: beaches, valleys, plains, deserts, lakes, and plateaus.  Orogeny- having to do with the making of mountains through tectonic processes.  hqnnTVk hqnnTVk

6 Elevation and Height  Mountain - A natural elevation of the earth’s surface rising into a summit.  Difference between a hill and a mountain is mostly height. The definition for each is based on local customs.  Summit- highest point on a hill or mountain.  We measure mountains in meters of feet above sea level or mean sea level.  Elevation - the measure of a mountain using sea level as zero height(Feet above sea level)

7  Actual height- of a mountain is the height of its summit above the lowest elevation of the surrounding terrain, or its base. It measures height from the mountain base.  Terrain - the nature of the surrounding land.  Base - lowest elevation of nearby terrain from which the mountain rises to a peak.  Relief - the difference in height between the highest and lowest elevations.  Mountainous areas have high relief, while plains and plateaus have low relief.

8 Groups of Mountains  Mountains exist in groups or by themselves.  Mountain Range- A series of mountain peaks in the same geographical area.  Mountain system- A group of mountain ranges connected over a much larger area.

9 7.B Tectonic Mountains  Tectonic mountains also form at Divergent zones.  The mid- Ocean ridge seems to exist because tectonic forces are slowly pulling rocks apart.  Tectonic mountains are created when tectonic plates collide, pull apart, lift up, or subside

10 7.7 Fold mountains  Sediment- is a deposit of eroded earth materials. It collects in low spots, usually in streambeds can also be carried and deposited by ice or wind.  When water deposits sediment it forms a flat layer.  Fold Mountains- mountains that form from folded rock strata.

11  Anticline - arch of rock layers.  The layers of rocks have been pushed into an upward force.  Syncline - is a trough or downward fold of rock strata formed just like an anticline.  Monocline- a motion that smoothly folds the strata above the fault into a single step.  When two tectonic plates converge it produces piles of mountains with complex folds and faults.

12 7.8 Rift Valleys  Rift- a series of steep-walled valleys lined with high cliffs rising from faults parallel to the valley. Most are located at mid ocean ridges between diverging oceanic plates  Grabens- a steep- sided valley framed by normal faults parallel to the length of the valley.

13  Fault-block mountains- mountains set apart by one or more normal faults. Are formed when tectonic forces exert in opposite directions.  Geologic province- is a region with characteristics that separate it from surrounding terrain.  Plateaus- are broad regions of relatively undisturbed sedimentary deposits lifted by some tectonic process. Many mountains today are plateaus.  Dome- is a landform with sedimentary strata that looks like an upside down bowl. Forms When magma underground pushes up.  Basin- is the opposite of a dome. Form when a magma chamber deep underground emptied.

14  Volcanoes and seamounts are mountains with deep tectonic activity that produces molten rock.

15 7c Non tectonic hills and mountains  Erosions - carries away particles by wind, gravity, flowing water, or wind to another location.  Erosions affects mountain, valleys, and shorelines. Erosions affects all rocks after they form.  Deposition -Sediments deposited to lakes underline the bottom of the lake. The sediments build up over time.

16 7.14  Erosional mountains- these mountains are carved by extensive erosion. Some parts of the mountain remain intact. The mountain contains harden lava.  Mesas- In western United States these hills are broad, flat-topped hills remaining from the erosion. Have steep cliff like sides  Buttes-smaller flat topped hills. Have steep cliff like slides.  Talus- piles of rock that collect at the bottom of a cliff.  Pinnacles- tall spires of rock that remain from eroded plateau. Can be found alone or in groups called fins.

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19  Monadnocks- is solidified magma that formed domed rock islands standing out of a flat plain surrounding them.  Monadnocks consist of a massive erosion resistant structure that formed beneath softer sediment  Stone arches are found along with fins and pinnacles.  Volcanic necks are all that remains of ancient volcanoes.  As a volcano erupts and builds the mountain, the magma tube that leads to the crater grows.  If the volcano goes extinct the magma hardens and remains in the mountain.

20 7.15  Depositional mountains- sediments build up on land and other landforms.  Sand dunes- made by wind depositing sand which create hills of sand.  Glacier till- is made up of rocks, gravel, sand, and silt taken up and pulverized by a glacier’s motion.  Volcanoes are considered depositional mountains because they build up when liquid and solid rock materials from eruptions are deposited on the earth’s surface.


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