Forests(because of trees, water, and other plants and animals living there.)
Indentured servants. The headrights system allowed planters to be given 50 acres of land for every person they payed for to come over.
More hydrothermal resources exist in the Western regions of the United States because lack of groundwater and extended drought has reduced the number of vents.
I would say that the resource you could use to find the meaning of <em>ambiguous </em>is the dictionary.
An almanac is an annual publication about weather, crops, etc.
A thesaurus is a dictionary of synonyms.
An encyclopedia is self-explanatory.
