An experiment which seems to validate a hypothesis:
must be correct
should be repeatable by other scientists
is all that is required to draw a conclusion

Your hypothesis does not need to be correct
your directions in should be very well described so other scientist can repeat the experiment correctly
in order to draw a conclusion you need to have completed the experiment 
the conclusion is when you state whether or not you hypothesis is correct or incorrect

Characteristic expected of mineral from lava at earth's surface

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.

Of the cold they can survive in the cold