floor

1 - When he moved in the house had five bedrooms, so he decided to convert one on the first floor into a bathroom.

2 - Oil and natural gas were formed from the slow decomposition and burying of planktonic marine plants and animals that sank to the mud of the sea floor.

3 - The scientists deduced that relatively small sections of the ocean floor in the region, and perhaps in other similar places, may be slowly rotating.

4 - The latest Japanese vacuum cleaners contain sensors that detect the amount of dust and type of floor.

5 - Ancient sea floor sediments show that a supernova exploded during the Pliocene era and may have caused a minor extinction event on Earth.