Location
Explanation:
Giving out addresses is an example of describing the geographical theme of location of a place.
An address gives an absolute location of place that one can trace and be sure of.
A geographical theme helps to have a broad-view about the subject of geography.
These themes are location, place, region, movement and human - environment interaction.
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The element with the greatest number of valence electrons available for bonding is chlorine. Among all the choices, chlorine is the element that belongs to the higher group number, group 7. Selenium is from group 6. Boron is from group 5, while calcium is from 2. Since the group number also equates to the number of valence electrons, chlorine is the answer.
Geography uses other subject in it's studies. Very close to geography are geophysics and geology. Geophysics studies quantitatively physical phenomena of the planet Earth, geology studies composition of soil rocks and their development through history. Geography uses biology, statistics, mathematics and other subjects in order to better describe the Earth.