- Driftwood (Wikipedia)
Driftwood is wood that has been washed onto a shore or beach of a sea, lake, or river by the action of winds, tides or waves. It is part of beach wrack.
- Igneous rock (Wikipedia)
Igneous rock (igneous from Latin igneus ‘fiery’), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava.