Which describes the difference between a trade surplus and a trade deficit?

Deficit actually means deficiency or less, while surplus means abundance or more. In financial terms, trade deficit means that the imports of a country or a region are more than its exports; hence the overall trade worth of the respective country or region decreases with passage of time. While trade surplus means that the country or a region exports are greater than its imports, hence the overall trade worth of the respective country or region increases with passage of time.  

its so obvious. its 999 obviously.

c- companies fail to take environmental protection into account. i think