To figure out just where that earthquake happened, you need to look at
your seismogram and you need to know what at least two other
seismographs recorded for the same earthquake. You will also need a map
of the world, a ruler, a pencil, and a compass for drawing circles on
the map.
Use the drop-down menus and what you have learned about potassium-argon dating to complete the sentences.
Radioactive dating can be compared to an hourglass, with the
✔ unstable
elements on the top.
Scientists compare
✔ parent and daughter elements
in the rock to determine its age.
Potassium-argon dating is ideal for dating
✔ igneous
and
✔ ancient
rock.
The correct answer is - natural gas.
The natural gas is a fossil fuel, meaning that it is derived from the decomposition of organic matter, and through time went under certain processes in the crust that made its current composition.
This fossil fuel is known to cause much less pollution than the other fossil fuels, especially when compared to the oil and the coal which are both very big polluters.
The natural gas is distributed to the homes and factories through pipelines.
The main pollution form the natural gas doesn't come from its direct usage, but instead form the leaking during its transportation and moving it from one container to another. It releases a lot of methane in those cases which ends up in the atmosphere and contributes to the Greenhouse effect, but that is only very small amount.