12.1
What is inner core, outer core, lower mantle, upper mantle, crust.
Earth is very rich in a variety of _______ that most neighboring planets do not have.
What is minerals.
What is recycling metals.
Human populations are affected by these events
What is natural disaster.
Massive movements of the earths crust are due to ___________
What is convection currents under earth's surface.
Our economy is very dependent on this type of resource. It can effect economic and political powers.
What is metals.
The practice of acquiring valuable resources by rinsing the sediments away in a stream is called.
What is placer mining.
Sea swells that can reach 1,000 Km per hour.
What is Tsunami
Earth's crust is made of many minerals. Which is the most abundant in the earth's crust?
What is oxygen.
Limestone, sand, and gravel are all considered.
What is nonmetals.
This type of extraction is one of the earth's major sources of air pollution.
What is smelting.
What is Earthquake.
Each layer of the earth has a different composition and density. Continental crust is ___________ and oceanic crust is ______________.
What is thicker and lighter, denser and similar to the mantle.
Rock formed by hot molten magma and lava.
What is igneous rocks.
Methane can be extracted by a process called ______ which can disrupt aquifers.
What is hydraulic fracturing.
Magma vents that release molten lava.
Earth's plates are constantly moving. In many regions, the plates will slip over another. The process of one plate slipping under another is called ________.
What is subduction.
Depending on ______ and ________, different rocks are formed.
What is depths from surface and pressure.
Almost half of the earths coal comes from _____.
What is strip mining.
Due to overly moist soil, patches of land are susceptible to this.
What is landslide.