Once the rover reaches its target, the rock abrasion tool, or Rat, will be used to expose fresh rock for analysis.

BBC: Revving up the rovers

Sougarret said the drill hammer had been swapped out but hit fresh problems after running into rock that was tougher than expected.

CNN: STORY HIGHLIGHTS

Drilling a few centimetres inside a rock provides a fresh sample that is free from the alteration that can occur at the surface as a result of weathering or radiation damage.

BBC: Curiosity Mars rover hammers into rock

At The Harbour Chip Shop, Portree, there's daily landed pollack (lythe) or rock salmon that make interesting alternatives to the standard haddock or cod, accompanied by fresh, hand-cut chips.

BBC: Insider��s guide to Skye

Construction workers push carts on rail tracks, left over from mining days, through seemingly endless tunnels carved through metamorphic rock, while scientists head straight to their lab spaces, spotless and chilly in their fresh coat of white paint.

WSJ: Physicists Look for Dark Matter Underground

Murray said Thursday that if the miners survived the collapse, they could continue to live on fresh air, food and water supplied through the holes until crews can remove tons of coal and rock that clogged a collapsed tunnel.

CNN: Camera lowered into mine cavity shows 'survivable space'