12. The earliest known forms of life on Earth were microbes similar to modern bl
ID: 295150 • Letter: 1
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12. The earliest known forms of life on Earth were microbes similar to modern blue-green algae b) insects c) one-celled animal d) simple worms e) corals er than those referred to in 13. It seems unlikely that we will ever find fossils much old Q10, 11 &12 above because a)) Earth's surface was too hot due to radioactive decay of some isotopes b) Earth was under heavy asteroidal and cometary "attack c) Earth had no oxygen in its atmosphere d) Earth had no oceans e) some combination of "a" and 'b" According to modern cosmological (astronomical) theory, the element iron, which forms the basis of our material culture (iron age" in archeology) was created how? 14. a) during the 'big bang b) during early stages of star evolution more than 10 billion years ago as part of the origin of our Galaxy d) in the centres of the most massive stars e) during supernova events 15. Which of the following processes was likely of primary importance on Earth during the Hadean? a) accretion and impacts by comets and asteroids b) planetary differentiation c) tectonic mountain building d) all three of a-c more-or-less equally e) mainly a & b 16. "Isotopes are a) varieties of atoms belonging to the same element but which have different b) varieties of atoms belonging to the same element but which have different c) varieties of atoms belonging to different elements and which have atomic weights numbers of protons in their nucle d) varieties of atoms belonging to different elements but which have the same atomic weights e) atoms that have special meaning to geologistsExplanation / Answer
12. c. One called animal
* these are the microorganisms which lives in a colony.
14. e. During the supernova events
Much energy was released during supernova explosion, which resulted in the formation of iron.
15. e. Mainly a and b.
16. a. Varieties of atoms belonging to the same element but which have different atomic weights.
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