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sci 4 quarter mb
| Question | Answer |
|---|---|
| The moon completes one revolution around the earth every ____ days | 27 |
| a lunar month is the period of time from one __________ to the next | full moon |
| because of the earth's rotation around the sun, the period from one full moon to the next is _____ days | 29.5 |
| the moon is ____________ km away from the sun | 380,000 |
| the moon is made up of ___________ rock with a core of _______ and __________ | igneous iron sulfer |
| the moon has a rocky crust made up of ________ and __________ | aluminum calcium |
| the gravity on the moon is ______ of earth's gravity | 1/6 |
| the first man set foot on the moon on ______ | June 1969 |
| the moons radius is about ___% of Earth's Its mass is more than ____% of Earth's | 27% >1% |
| its is relatively ________ from Earth than most moons | farther |
| Earth's moon is made of _______, while the moons of the outer planets are made of gas | rock |
| the amount of sunlight that its surface reflects | albedo |
| the moons albedo: | 7% |
| the earths albedo: | 31% |
| the moon has no atmosphere- it has _________ temperature differences from the sunlit side to the dark side. | extreme |
| there is no _________ on the moon | erosion |
| light in color, mountainous and covered with craters | highlands |
| dark, smooth plains that are significantly lower than the highlands | maria |
| craters formed when space objects crash to the surface | impact craters |
| the material blasted out during impact and falls back to the surface | ejecta |
| long trails of ejects that radiate outward from the craters | rays |
| meandering, valley like structures found on maria | rilles |
| why does the moon have so many impact craters? | because it has no atmosphere |
| like the earth, the moon is made up of mostly ________ minerals. | silica |
| the highlands are made mostly of _______ that were fused together by impacts. | breccias |
| the amount of ______ is much lower on the moon than it is on Earth. | iron |
| maria are made mostly of ________. | basalts |
| Radiometric dating tells us that the moon is between ____ and _____ billion years old | 3.8 4.6 |
| the first 800 years of the moons existence it experienced lots of _______ which resulted in many broken rocks on the surface | impact |
| the ________ is a layer of loose, ground-up rock on the surface of the moon. this was formed during those first 800 years | regolith |
| since then, fewer impacts have occured. ______ then rose to the surface to fill in many impact craters. | Lava |
| the far side of the moon is _____ as thick as the near side, so much less lava reached the surface, and it is mainly highlands | twice |
| the moon has a structure very similar to Earth's. while there are no _______ _______, there are occasional ____________ that scientists measure with seismographs | tectonic plates moonquakes |
| there are no active _________ left and no ________ field, so scientists believe that the moon isn't tectonically active | volcanoes magnetic field |
| a large object got too close to the earth and was trapped by its gravity | capture theory |
| problem:the object would have had to been _______ to get caught | slow |
| problem:both objects are composed of the _________things | same |
| both bodies formed at the same time and in the same are | simultaneous formation theory |
| problem:the moon is ______ poor, while it is abundant on Earth | iron |
| Earth collided with an object the size of mars, ejecting material from both bodies into space where they merged to become the moon | impact theory |
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mbkapp