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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.

This is an ultra-rich in carbon MM found near the CONCORDIA station in Antarctica. Credit: J. Duprat, E. Dobrică, C. Engrand, J. Aléon, Y. Marrocchi, S.Mostefaoui, A. Meibom, H. Leroux, J.-N. Rouzaud, M. Gounelle and F. Robert.

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

To improve your score, read and study the lecture, the links contained within, listed under See also, External links and in the {{radiation astronomy resources}} or the {{principles of radiation astronomy}} templates. This should give you adequate background to get 100 %.

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Quiz edit

  

1 Yes or No, Micrometeorite is often abbreviated as MM.

Yes
No

2 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

3 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

.
single chain of tetrahedra

.
a continuous framework of tetrahedra

.
a ring of linked tetrahedra

.
a two-dimensional sheet of tetrahedra

isolated tetrahedra

.

4 Yes or No, Micrometeorites are generally less than 1 mm in diameter.

Yes
No

5 True or False, There are green or green mineral containing meteorites.

TRUE
FALSE

6 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

7 Yes or No, Microspherules that look like micrometeoritic microspherules are usually of terrestrial origin.

Yes
No

8 True or False, There are blue or blue mineral containing meteorites.

TRUE
FALSE

9 Complete the text:

The majority of known asteroids orbit the Sun between the orbits of

and

.

10 Yes or No, The sparks recovered from lighters consist of microspherules.

Yes
No

11 True or False, There are red or red mineral containing meteorites.

TRUE
FALSE

12 Phenomena associated with some meteorites?

have a gaseous surface
long nickel-iron crystals
octahedrite
kamacite
taenite
plessite

13 Yes or No, MM 119 contains extremely large amounts of carbon as well as excesses of deuterium.

Yes
No

14 True or False, There are violet or violet mineral containing meteorites.

TRUE
FALSE

15 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

16 Yes or No, MM 119 was recovered from 40 to 55 year-old snow and contained no crystalline materials.

Yes
No

17 True or False, There are cyan or cyan mineral containing meteors or meteorites.

TRUE
FALSE

18 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

19 Yes or No, To reduce contamination from human activity and industry, micrometeorites are collected from remote locations such as Antarctica.

Yes
No

20 True or False, There are yellow or yellow mineral containing meteorites.

TRUE
FALSE

21 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

.
2-3 gigapascals and 700°C

.
22-460°C tabular crystals

.
trigonal tectosilicate

.
35 GPa to 40 GPa orthorhombic

1470°C cubic or tetragonal form

.

22 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

23 True or False, There are orange or orange mineral containing meteorites.

TRUE
FALSE

24 Meteorites found on Earth may be from which of the following?

Saturn
Mercury
the Moon
the asteroid belt
Jupiter
Mars

25 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

26 True or False, The visible path of a meteoroid that has entered the Earth's atmosphere is called a meteorite.

TRUE
FALSE

27 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

28 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

29 True or False, A metallic or stony object that is the remains of a meteor is called a meteoroid.

TRUE
FALSE

30 True or False, Seifertite has only been found in Martian and lunar meteorites.

TRUE
FALSE


Hypotheses edit

Main article: 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.

See also edit

External links edit

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