Poland’s natural resources include a. iron ore, petroleum, and scenic coastal areas b. vast stands of forests with valuable timber c. coal, sulfur, copper, and open fields with fertile soil d. clean water supplies and huge, untapped deposits of gold

Letter c. is correct.

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Answer they are produced by collision of tectonic plates;

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion