For a surface storm system to intensify, the upper trough of low pressure must be located to the of the surface low.

980 is the correct answer

Here is a picture  of the net. its 4 squares in a row diagonal and on the third draw one square aove and under

Answer (d) the greenhouse effect is primarily caused by car and trucks;

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city.