Micrometeorites/Quiz

Micrometeorites is a lecture about micron-size meteorites that have been recovered on Earth and other astronomical objects. It is included as a quiz section minilecture from the radiation astronomy department for the course on the principles of radiation astronomy.

You are free to take this quiz based on micrometeorites at any time.

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Enjoy learning by doing!

Quiz
{Yes or No, Micrometeorite is often abbreviated as MM. + Yes - No
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{True or False, An oxygen isotope discrepancy was noted forty years ago in a stony meteorite that exploded over Pueblito de Allende, Mexico. + TRUE - FALSE
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{Complete the text: Match up the type of silicate with the name: cyclosilicate - A inosilicate - B orthosilicate - C sorosilicate - D phyllosilicate - E tectosilicate - F structurally isolated double tetrahedra { D (i) }. single chain of tetrahedra { B (i) }. a continuous framework of tetrahedra { F (i) }. a ring of linked tetrahedra { A (i) }. a two-dimensional sheet of tetrahedra { E (i) } isolated tetrahedra { C (i) }.
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{Yes or No, Micrometeorites are generally less than 1 mm in diameter. + Yes - No
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{True or False, There are green or green mineral containing meteorites. + TRUE - FALSE
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{Moldavite is a mineral that may be associated with what green astronomy phenomenon? - predicting the end of the Earth - determine the accuracy of local computers + meteorite impacts - demonstrating that Venus was once a comet - predict when currently dormant volcanoes will erupt + green fireballs
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{Yes or No, Microspherules that look like micrometeoritic microspherules are usually of terrestrial origin. + Yes - No
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{True or False, There are blue or blue mineral containing meteorites. + TRUE - FALSE
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{Complete the text: The majority of known asteroids orbit the Sun between the orbits of { Mars|Jupiter (i) } and { Jupiter|Mars (i) }.
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{Yes or No, The sparks recovered from lighters consist of microspherules. + Yes - No
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{True or False, There are red or red mineral containing meteorites. + TRUE - FALSE
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{Phenomena associated with some meteorites? - have a gaseous surface + long nickel-iron crystals + octahedrite + kamacite + taenite + plessite
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{Yes or No, MM 119 contains extremely large amounts of carbon as well as excesses of deuterium. + Yes - No
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{True or False, There are violet or violet mineral containing meteorites. + TRUE - FALSE
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{A thin-section of a meteorite that may be analyzed has which of the following? + a great many light gray and dark gray chondrules present + large grain cross sections making sizing easy + an available sizing or magnification marker + independent verification as a meteorite + correctable diameters and relative abundances + optical conditions
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{Yes or No, MM 119 was recovered from 40 to 55 year-old snow and contained no crystalline materials. - Yes + No
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{True or False, There are cyan or cyan mineral containing meteors or meteorites. + TRUE - FALSE
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{A natural rocky source of chemicals from the sky to the ground may originate from what astronomical source? - Jupiter - the solar wind - the diffuse X-ray background - Mount Redoubt in Alaska + the asteroid belt - the International Space Station
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{Yes or No, To reduce contamination from human activity and industry, micrometeorites are collected from remote locations such as Antarctica. + Yes - No
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{True or False, There are yellow or yellow mineral containing meteorites. + TRUE - FALSE
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{Complete the text: Match up the form or type of quartz with the effect: alpha quartz - A coesite - B cristobalite - C stishovite - D seifertite - E tridymite - F 10 GPa and above 1200°C { D (i) }. 2-3 gigapascals and 700°C { B (i) }. 22-460°C tabular crystals { F (i) }. trigonal tectosilicate { A (i) }. 35 GPa to 40 GPa orthorhombic { E (i) } 1470°C cubic or tetragonal form { C (i) }.
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{Yes or No, With no atmosphere and little erosion, some hypothesized that the Moon had been collecting the very same micrometeorite materials as the Earth — but in far greater quantities. + Yes - No
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{True or False, There are orange or orange mineral containing meteorites. + TRUE - FALSE
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{Meteorites found on Earth may be from which of the following? - Saturn - Mercury + the Moon + the asteroid belt - Jupiter + Mars
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{Yes or No, With no atmosphere and little erosion, some hypothesized that the Moon had been collecting the very same micrometeorite materials as the Earth — but in far greater quantities. + Yes - No
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{True or False, The visible path of a meteoroid that has entered the Earth's atmosphere is called a meteorite. - TRUE + FALSE
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{Considering that many rock types bear a striking resemblance to meteorites which are the one or few ways to differentiate a meteorite from a terrestrial rock? + chondrules - the Ca/Si ratio - the Al/Si ratio - enstatite rather than diopside + oxygen isotope ratios + observed orbit and fall with verified recovery
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{Yes or No, Most MMs are broadly chondritic in composition, meaning that major elemental abundance ratios are within about 50% of those observed in carbonaceous chondrites. + Yes - No
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{True or False, A metallic or stony object that is the remains of a meteor is called a meteoroid. - TRUE + FALSE
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{True or False, Seifertite has only been found in Martian and lunar meteorites. + TRUE - FALSE
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Hypotheses

 * 1) Micrometeorites should also be coming in to Earth from other large rocky objects such as Mercury, asteroids, and the satellites of the gas giants.