1.   Most volcanic rocks contain some phenocrysts - they are a bit like the pips in raspberry jam.

2.   The oldest Tertiary rocks contained archaic mammals that bore no resemblance to the living families within the class.

3.   The rock contains minute quantities of copper.

4.   These rocks contain the fossilised remains of extinct animals.

5.   He discovered, on closer inspection, that the rocks contained gold.

6.   First, the rock contains little globules of carbonate.

7.   In August, the researchers reported in Science magazine that the rock contained two key signs of Martian life.

8.   In that case, the rock could contain a mix of basalt, derived from lava, and granite that were brought together by water transport.

9.   It was several years, though, before Chinese and American scientists realized the rocks contained anything more than algae fossils.

10.   Kyte also found that the tiny rock contained an unusual quantity of the rare element iridium, abundant in asteroids.