1.   Basalts are the dark lava rocks that fill Mare basins.

2.   And I feel so horticultural, now that I have them planted in either fir bark or a special orchid mix containing everything from coconut husk to lava rock.

3.   Another advance is that many manufacturers have decided to do without the lava rocks in gas grills.

4.   Armed with walking sticks, we clamber over the lava rock to the entrance.

5.   Beneath the waves, submerged gardens contain beds of lava rock rich in coral and marine life.

6.   After about a year and a half, the lava rock of the first turned white and the tree died.

7.   Gas grills use flame and can utilize lava rock or ceramic briquettes to increase and retain the heat.

8.   Large pockets of water created by the bigger lava rocks make for tricky casting.

9.   Lava rocks!

10.   Start by inspecting the lava rocks or ceramic briquettes on the heat distribution grid.