Sunday, July 20, marked 45 years since the United States put the first two astronauts safely on the moon. The cost for the Mercury, Gemini and Apollo programs was more than $25 billion at the time more like $110 billion in today’s world. The ensuing U.S. space efforts have cost an additional $196 billion for the shuttle and $50 billion for the space station. NASA’s total inflation-adjusted costs have been more than $900 billion since its creation in 1958 through 2014 (more than $16 billion per year). Looking back, have we gotten our money’s worth from the investment?
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Answer:
are telescopes that can take images of invisible energy
observe electromagnetic radiation that is blocked by our atmosphere
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Answer:
false Metamorphic rocks can only form from pre-existing rocks. Metamorphic rocks only form as a result of metamorphism of igneous or sedimentary rocks. Rock melting to form magma defines the upper limit of metamorphic processes. The oldest rock exposed to Earth's surface is a metamorphic rock.
Explanation:
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Glacial evidence in african continent and in indian subcontinent , which is very warm region now are the evidence of continental drift .
Scientists Have Found Hidden Evidence of Ancient Ice Streams in The African Desert. Once, about 300 million years ago, when southern Africa was joined at South America's hip, this now arid region was covered in a wide expanse of glaciers.
- here Continental drift is the hypothesis that the Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed.
- In the early part of the 20th century, scientists began to put together evidence that the continents could move around on Earth’s surface.
- The evidence for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones.
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A) some kind of subduction zone
