Is open-pit mining sustainable? Or not? Explain your answer.

answer; native americans who sometimes actively impeded railroad construction; physical obstacles like rivers and canyons, and

81 is a composite number.

the proximity of water was an advantage to western europe and its culture was able to flourish as a result. trade and travel by sea were easier and safer in historical times.

1. there are no mountains to protect it from the sea

2. and its has wet cool summers and wet, mild winters.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.