(questions on telecomm data for climate)
the record-breaking cold winter of 2013-2014 across the midwest u. s. was associated with which of the following?
a.
easterly qbo
b.
positive tnh
c.
negative pna
d.
positive nao

C) Negative PNA

Explanation: PNA refers to the Pacific-North American tele-connection pattern which is responsible for the variations occurring in the atmospheric pressure and thus changing the atmospheric circulation. The natural variation in the climate can be in positive or negative phase .

The winter in 2013-2014 across Midwest US was due to negative PNA  because there was higher than average atmospheric pressure off the coast of Northern America. Thus option(c) is the correct answer.

there's multiple reasons why the conquistadors were so successful in colonizing central america, and some of them are:

- they were seen as gods;

at the beginning, the spanish settlers were seen by the natives as gods, and this was mainly due to their white skin, and the way they came with their boats.

- possessed superior weaponry;

the spanish had gunpowder and guns, as well as cannons, while the natives did not had any fire weapons.

- made cleaver alliances;

they used the situation of tribes hating each other, so they made alliances with some of them which served them very well.

- brought diseases;

the native people were not immune to certain diseases the europeans brought with them, so they were dying from seeming harmless things for european standards.