Weegy: An island arc is a type of archipelago, often composed of a chain of volcanoes, with arc-shaped alignment, situated parallel and close to a boundary between two converging tectonic plates.
User: Which colorless and odorless gas, produced by radioactive decay of Uranium-238, is considered to be a form of pollution?
User: The Cenozoic Era is best described as the era in which
A. mammals began to dominate the land.
B. multicellular life diversified.
C. dinosaurs emerged.
D. a mass extinction event occurred.
User: nother name for unicellular organisms that dominated Earth up to the Precambrian time is
A. stromatolites.
B. cyanobacteria.
C. prokaryotes.
D. eukaryotes.
Weegy: Another name for unicellular organisms that dominated Earth up to the Precambrian time is STROMATOLITES.
User: Until the early _______ there were only negligible amounts of free oxygen in the atmosphere.
A. Precambian
B. Mesozoic
C. Cenozoic
D. Proterozoic
Weegy: Until the early precambian there were only negligible amounts of free oxygen in the atmosphere.
User: The building blocks of proteins are known as
A. euphoric acid.
B. oxygen.
C. carbon dioxide.
D. amino acids.
Weegy: The building blocks of proteins are known as AMINO ACIDS.
User: Platinum can be found in which of the following formations?
A. Sedimentary bands
B. Aggregates
C. Chromite bands
D. Hydrothermal veins
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