![WeknowmoreaboutthesurfaceoftheplanetMarsthanweknowabout...]( "WeknowmoreaboutthesurfaceoftheplanetMarsthanweknowabout...")
- 问题详情：WeknowmoreaboutthesurfaceoftheplanetMarsthanweknowaboutwhatisatthebottomofEarth'soceans.Untilrecently,scientistshadmappedonlyabout20percentoftheseafloor.Butourknowledgeofthedeepseasischangingbecauseofinformationfromsatellites.Scientistshavep...
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