Why is cyanide heap leaching used to extract gold from some deposits?

Which of the following emerging technologies uses the principle of chromosomes to identify suspects

Soweto was the site of one of the that swept across south africa in the late 1970s. in his effort to end apartheid, desmond tutu turned to . the united states responded to south africa’s apartheid policy in the 1980s by .

#4.) describe the most likely weather conditions at indiana / ohio boarder. also could someone double check my other answers? i'd really appreciate it