Need now which materials allow heat to pass through them easily?

The materials which allow heat to pass through them easily are conductors of heat. For examples,aluminum, iron, and copper.

Hope this helps! ;)

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)