When did Earth form? A. during the Precambrian supereon B. during the Proterozoic eon C. during the Jurassic period D. during the Cenozoic era

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Q: When did Earth form? A. during the Precambrian supereon B. during the Proterozoic eon C. during the Jurassic period D. during the Cenozoic era

A: d

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User: When did Earth form? A. during the Precambrian supereon B. during the Proterozoic eon C. during the Jurassic period D. during the Cenozoic era

Weegy: d
mjane25|Points 746|

User: Which radioactive decay process has the longest half-life and is useful in determining the absolute age of Earth's oldest rocks? A. uranium-235 to lead-207 B. rubidium-87 to strontium-87 C. potassium-40 to argon-40 D. uranium-238 to lead-206

Weegy: D. uranium-238 to lead-206
OneRepublic|Points 665|

User: Which commonly occurring fossil is a bivalve? A. coral B. crinoid C. pectinoid D. bryozoan

Weegy: A)coral
MABOO11|Points 655|

User: Which element has a radioactive isotope that is often used to date rocks younger than about 60,000 years? A. uranium B. rubidium C. carbon D. strontium

Weegy: C)carbon has a radioactive isotope that is often used to date rocks younger than about 60,000 years.
debnjerry|Points 40200|

User: What is the largest unit of geologic time? A. period B. epoch C. eon D. supereon

Weegy: D.supereon

The largest defined unit of time is the supereon, composed of eons. Eons are divided into eras, which are in turn divided into periods, epochs and ages.

User: Which landform is created by Aeolian processes? A. dune B. fjord C. gully D. scree

Weegy: A
trena99|Points 446|

User: Which fossil-building process is said to have taken place when the original organism has been completely dissolved, leaving a hole in the rock that can later be filled by some other material? A. permineralization B. cast and mold C. compression D. replacement and recrystallization

Weegy: A. permineralization
pathwise|Points 1257|

User: Eskers, kames, and drumlins are landforms that are created by which processes? A. glacial processes B. alluvial processes C. volcanic processes D. erosional processes

Weegy: A)glaial proceses
selymi|Points 9306|

User: Which geological time boundary marked the extinction of dinosaurs? A. Cretaceous-Tertiary B. Jurassic-Cretaceous C. Paleozoic-Mesozoic D. Permian-Triassic

Weegy: C. mesozoic
lexiecklund|Points 0|

User: The chemical composition of certain crystals in metamorphic rocks can help determine which characteristic of the rock? A. absolute age B. relative age C. permanent age D. universal age

Weegy: B)
mfarver|Points 0|

User: Which term describes the preserved remains or traces of animals, plants, or other organisms from long ago? A. cast B. fragment C. artifact D. fossil

Weegy: D. fossil remains or traces of animals, plants, or other organisms from long ago.
sujaysen|Points 2935|

User: The Mesozoic era marked the emergence of which life forms? A. dinosaurs B. trilobites C. insects D. mammals

Weegy: A.dinosaurs

The Mesozoic Era is an interval of geological time from about 250 million years ago to about 65 million years ago. It is often referred to as the Age of Reptiles because reptiles, namely dinosaurs, were the dominant terrestrial and marine vertebrates of the time.

User: Which landform is NOT classified based on the characteristics of its slope? A. hill B. ridge C. basin D. mesa

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Asked 11/15/2012 11:33:31 AM

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