Rock on a planet is also important.

行星上的岩石也很重要。

youdao

The rover should have at least one Martian year, to roam the planet, during which time it will collect, grind and analyze around 70 samples of rock and soil.

流浪者至少要待一个火星年，去漫步这个星球，在这期间，它将收集、研磨和分析大约70个岩石和土壤样本。

youdao

However, if the planet is in a good position, astronomers look for three key things: water, air and rock.

然而如果这颗行星处于很好的位置，天文学家会寻找三样关键的东西：水、空气和岩石。

youdao

These lines follow underwater mountains, where hot liquid rock flows up from deep inside the planet.

VOA: special.2010.01.12

New crust is created as melted rock pushes up from inside the planet.

VOA: special.2010.01.12

John Bachar said rock climbing felt like being on another planet.

VOA: special.2009.12.09

Mr. LISSAUER: We believe this discovery of this small planet is a rock-solid discovery, even though the planet itself may or may not be solid rock.

NPR: Astronomers Find Planet with Similarities to Earth

Korea's, meanwhile, dates back 8-9, 000 years - the oldest documented anywhere on the planet - with ancient rock art showing the unmistakeable coming together of harpoon and whale, and piles of bones testifying to their consumption.

BBC: South Korea's whaling: Faux and cons

His "rock ballad" Lonely Planet will be performed at this year's contest in Sweden by Armenian act Dorians.

BBC: Sabbath star Tony Iommi pens Armenian Eurovision entry