Question

the mars rover mission
1 are we alone in the universe? it is perhaps the biggest question humans have posed. in our efforts to answer it, we have developed complex telescopes, which have let us discover distant planets that may be suitable for extraterrestrial life. but while telescopes monitor mysterious planets in the far reaches of the galaxy, the mars rovers have been studying the possibility of life right in earths neighborhood.
2 a mars rover is a robotic explorer, a vehicle with wheels
based on the text, what three findings from spirit indicate that water once existed on mars?
spirit landed in what may be a lake bed.
spirit found goethite.
spirit unearthed ground with a lot of silica.
spirit discovered an ancient geyser.

Explanation:

The text mentions that Spirit landing in a possible lake - bed implies past water presence as lakes are formed by water. Goethite is a mineral that often forms in the presence of water. Ground with a lot of silica can also be an indicator of past water - related processes.

Answer:

Spirit landed in what may be a lake bed.
Spirit found goethite.
Spirit unearthed ground with a lot of silica.