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Underground salt deposits can be dissoved by ground water and carried away. What may happen next?
bottom of canyon
A medium hill with a flat top and steep sides
volcanoes
so scientists can warn people to evacuate the area
Ice freezes in the rock at night, cracking them
over 5,000 years
Erosion could make it possible for it to collapse
The ground may collapse
How long has it taken the Grand Canyon to form?
bottom of canyon
A medium hill with a flat top and steep sides
volcanoes
so scientists can warn people to evacuate the area
Ice freezes in the rock at night, cracking them
over 5,000 years
Erosion could make it possible for it to collapse
The ground may collapse
Landscape Arch in Arches National Park had to be closed to visitors hiking near the base. How could an arch become dangerous?
bottom of canyon
A medium hill with a flat top and steep sides
volcanoes
so scientists can warn people to evacuate the area
Ice freezes in the rock at night, cracking them
over 5,000 years
Erosion could make it possible for it to collapse
The ground may collapse
What is a mesa?
bottom of canyon
A medium hill with a flat top and steep sides
volcanoes
so scientists can warn people to evacuate the area
Ice freezes in the rock at night, cracking them
over 5,000 years
Erosion could make it possible for it to collapse
The ground may collapse
It has taken millions of years for the Grand Canyon to build up and break down. Where would the oldest rocks of the canyon most likely be?
bottom of canyon
A medium hill with a flat top and steep sides
volcanoes
so scientists can warn people to evacuate the area
Ice freezes in the rock at night, cracking them
over 5,000 years
Erosion could make it possible for it to collapse
The ground may collapse
Why would it be helpful to the general public for scientists to predict earthquakes?
bottom of canyon
A medium hill with a flat top and steep sides
volcanoes
so scientists can warn people to evacuate the area
Ice freezes in the rock at night, cracking them
over 5,000 years
Erosion could make it possible for it to collapse
The ground may collapse
Which best completes this chart? 1. Uplift 2. Earthquakes 3.
bottom of canyon
A medium hill with a flat top and steep sides
volcanoes
so scientists can warn people to evacuate the area
Ice freezes in the rock at night, cracking them
over 5,000 years
Erosion could make it possible for it to collapse
The ground may collapse
In the spring, rocks often fall onto mountan roads. Why?
bottom of canyon
A medium hill with a flat top and steep sides
volcanoes
so scientists can warn people to evacuate the area
Ice freezes in the rock at night, cracking them
over 5,000 years
Erosion could make it possible for it to collapse
The ground may collapse
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