What characterized the Ordovician in terms of invertebrate life, and how does that relate to what was

happening geologically? What will be an ideal response?


A major transgression in the Middle Ordovician brought to the continent a vast, shallow sea with a
warm climate, so shelly fauna increased in diversity and number. Extensive glaciation in Gondwana at
the end of the period caused a regression and a mass extinction of more than 100 families of marine
invertebrates.

Environmental & Atmospheric Sciences

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Explain the advantages and disadvantages of the raster data model vs. the vector data model.

What will be an ideal response?

Environmental & Atmospheric Sciences

What did the United States Exclusive Economic Zone exclude from the original 1982 United Nations

Treaty? a. The claim of territorial waters b. The protection of the ocean c. The sharing of high seas resources d. The prevention of pollution

Environmental & Atmospheric Sciences

What planktonic group accounts for 80% of all photosynthesis in the tropics?

a. Picoplankton b. Nanoplankton c. Microplankton d. Mesoplankton

Environmental & Atmospheric Sciences

Which role of earth scientists most directly relates to forecasting hurricane paths?

A. protecting the health of the environment B. finding and sustaining earth resources C. ensuring the future of human life D. protecting against natural hazards

Environmental & Atmospheric Sciences