Answer:
Half-life is defined as the time required by an unstable element to reduce half of its original value. All unstable elements have a decay rate and this half-life differs from element to element. These unstable elements are known as radioactive elements. It continuously decays until it becomes a stable one. These elements when decays release radiations which are harmful to lives.
This half-life plays an important role in the determination of the age of a rock or fossils. It is used in various types of radiometric dating methods.
For example, the half-life of Carbon-14 is approximately 5700 years and the half-life of Uranium-238 is 4.5 billion years.
The answer is D (they usually occur on the boundaries of plates.
Answer:
Magnitude
Explanation:
Earthquakes are typically measured in units of magnitude. The news usually use the most popular measurement scale called the Richter Scale which rates an earthquake by the size of its seismic waves on a scale from 1 to 10.
Ex. Mexico had a 7.1 magnitude earthquake
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- A. Hazle <3
<span> its unclear why you couldn't mine profitably here. but it would be extremely dangerous to do this on a continent where the conditions are extremely inhospitable to just about all life forms .</span>
Answer:
Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava.
Explanation:
(if you need a not googled answer)- Igneous rocks are cooled or sollidified lava/ magma.
