The Rock Cycle
How Landforms are Created
Forces That Change Landforms
Earth's Structure
The Effects of People
100
how rocks change, over time, as they are melted, cooled, broken, and squeezed.
What is the rock cycle?
100
natural bridges that are formed when wind and water wears away the sedimentary rock underneath them
What are arches?
100
the process of transporting rocks, rock particles, and soil over long distances
What is erosion?
100
the hottest layer of the Earth which is a ball of solid metal
What is the inner core?
100
to get wood and make paper
Why have people cut down forests?
200
rock that that is formed by layers being squeezed together
What is sedimentary rock?
200
formed when a river cuts through the land
How is a canyon formed?
200
caused by fast moving rivers and streams
What causes erosion?
200
the layer under the crust which makes up most of the planet
What is the mantle?
200
to get a constant supply of fresh water
Why do people build dams?
300
rock formed from red-hot lava erupting from a volcano
What is igneous rock?
300
formed when two plates collide, pushing the land up
How is a mountain formed?
300
the process of wearing away Earth's surfaces
What is weathering?
300
the outer layer of the Earth where people live
What is the crust?
300
to stop rivers from flooding and crops from damage
Why do people build levees?
400
rock that forms from any kind of rock as the result of heat and pressure
What is metamorphic rock?
400
formed when a volcano erupts on the ocean floor and the lava piles up high enough to stick out of the wa]]]]
How is an island formed?
400
the process of rivers leaving or depositing particles in new places
What is deposition?
400
the movement of Earth's plates
What is plate tectonics?
400
to get minerals such as silver and copper
Why have people left scars on the land from mining?
500
sedimentary rock may contain the remains of living things that became trapped
What rock may contain fossils?
500
plates slowly pass by each other in different directions and suddenly jolt
What causes an earthquake?
500
by glaciers scraping out low areas of land which then filled with meltwater
How are many lakes formed?
500
created when mountains formed near cracks in the crust where plates collide
What has created some of Earth's tallest mountain ranges?
500
having no grass planted on the hill
What causes soil erosion on hills?
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