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The longest interval of time is called _____. an eon a period an era a century User: The Cretaceous-Tertiary extinction, the most famous of the Big Five, has been attributed to what major event(s) that triggered the extinction of the dinosaurs? a giant asteroid hitting the earth massive volcanoes erupting around the world rapid growth of forests on land surfaces falling sea levels increased competition from mammals
Weegy: an asteroid hitting the earth User: The era that is defined by both a huge explosion in the diversity of life as well as the largest mass extinction is the _____. Proterozoic Paleozoic Mesozoic Cenozoic Weegy: : The era that is defined by both a huge explosion in the diversity of life as well as the largest mass extinction is the B. Paleozoic era. User: Scientists think the earth is approximately _____ years old. 2 billion 3 billion 4 ½ billion 6 ½ billion User: In order to accurately determine absolute time, you need to know which of the following? the rate at which radioactive decay occurs a collection of fossil shells from sedimentary rocks how much radioactive decay has occurred a sequence of rock layers User: Geological evidence of the age of the earth includes _____. radiometric dating of rocks fossil evidence comparative anatomy molecular clocks gradual processes of rock formation Weegy: All can be applied. User: The long-term weather patterns that are typical in a location are the location's User: what kind of new animal fossil would he most likely find next in the layers of rock above it? a fossil of an amphibian a fossil of a reptile a fossil of a fish a fossil of a human (More)
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Updated 7/2/2012 6:57:58 AM
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Scientists think the earth is approximately 4 ½ billion years old.

Added 7/2/2012 6:57:59 AM
Rated good by Giana
Complete this American History enduring understanding. _____ made by people and nations impact and shape American History. Decisions Mistakes Choices Policies
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Updated 2/15/2014 7:31:37 AM
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CHOICES made by people and nations impact and shape American History.
Added 2/15/2014 7:31:37 AM
This answer has been confirmed as correct, not copied, and helpful.
The hottest layer of the earth is the _____. lower mantle crust asthenosphere inner core
Weegy: The hottest layer of the earth is the inner core. (More)
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Updated 3/28/2015 2:17:43 PM
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Silicon dioxide forms the cell walls of _____. diatoms insects plants
Weegy: cell wall made of silica (hydrated silicon dioxide) called a frustule (More)
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Updated 6/26/2012 4:03:39 PM
1 Answer/Comment
Silicon dioxide forms the cell walls of diatoms.
Added 6/26/2012 4:03:41 PM
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Rated good by John@evang
_____ algae are important in the formation of coral reefs. Brown Red Fire Golden-brown
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Updated 41 days ago|3/15/2017 11:47:38 PM
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Red algae are important in the formation of coral reefs.
Added 41 days ago|3/15/2017 11:47:38 PM
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