Fog is likely to occur when there is little difference between the dew point and the（）.

Where would you find information about the time of high tide at a specific location on a particular day of the year?（）

The circulation around a low pressure center in the Northern Hemisphere is（）.

In the Northern hemisphere northerly winds may cause temperature（）.

Shipboard Emergency Drills must be carried out at least（）on board cargo ship.