Los sismografos son aparatos utilizados para a) medir la humedad
b) medir la velocidad de los vientos
c) medir la presion atmosferica
d) registrar los movimientos sismicos

Registrar los movimientos sismicos.

Explanation: El sismografo es un instrumento que se utiliza para medir los movimientos de la tierra como sismos o terremotos.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.

1. artillery

2. jose san martin

3.their economies remained dependent on outside powers.

4. drafted new economies

5. democracies have replaced dictatorships