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What is meant by radioactivity?
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Updated 220 days ago|4/19/2014 12:03:18 PM
1 Answer/Comment
Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability.

Added 220 days ago|4/19/2014 12:03:18 PM
This answer has been confirmed as correct, not copied, and helpful.
an alpha partical is identical to a:
Weegy: alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together, [ thus having a mass of four units and a positive charge of two. ] (More)
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Asked 6/6/2013 5:38:20 AM
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Choose the category of connective used in the following example: He won the race easily. Nevertheless, his attitude prevented the team from being truly happy. take away or limit a preceding idea indicate order show consequence indicate repetition of an idea show space relationship
Weegy: Nevertheless, his attitude prevented the team from being truly happy. [ take away or limit a preceding idea indicate order show consequence indicate repetition of an idea (More)
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Asked 6/6/2013 5:39:29 AM
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3. Proterozoic eon
Weegy: Bacteria was first formed in the Archean eon, (More)
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Updated 6/6/2013 6:25:19 AM
1 Answer/Comment
The Proterozoic Eon is the period of Earth's history that began 2.5 billion years ago and ended 542.0 million years ago. It is subdivided into three eras: the Paleoproterozoic (2.5 to 1.6 billion years ago), Mesoproterozoic (1.6 to 1 billion years ago), and Neoproterozoic (1 billion to 542.0 million years ago).

Added 6/6/2013 6:25:19 AM
Which are physical processes User: what is a faults
Weegy: A fault is a break in the rocks that make up the Earth’s crust, along which rocks on either side have moved past each other. Not every crack in the ground is a fault. What defines a fault is the movement of the rock on either side. [ When that movement is sudden, the released energy causes an earthquake. Some faults are tiny, but others are part of great fault systems along which rocks have slid past each other for hundreds of miles. These fault systems are the boundaries of the huge plates that make up the Earth's crust. In the San Francisco Bay region, the Quaternary-active faults are part of the boundary between the Pacific and North American plates. ] (More)
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Asked 6/7/2013 5:38:09 AM
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