If you want to make an adverb out of the adjective <em>great, </em>you just add the suffix -ly: great - greatly. A company for which you work expanded it products this year greatly.
A company for which you work expanded its products this year. You wish to use a form of the word great to describe how much they've expanded. To change great to an adverb, add the suffix
Natural resources are resources that exist without any actions of humankind. This includes the sources of valued characteristics such as commercial and industrial use, aesthetic value, scientific interest and cultural value
