What are the scientific trends in grade three?

1 Wind direction refers to the direction in which the wind blows. It is usually understood by the basic direction or orientation. There are various instruments used to measure the wind direction, such as wind bags and wind vanes.

2. Eight basic wind directions: east, south, west, north, northeast, northwest, southeast and southwest.

3. Wind-level songs ".

The zero-level smoke column goes straight into the sky, and the first-level smoke deviates with the wind;

The second-level breeze blows the surface, and the third-level leaves move the red flag exhibition;

Four-level branches shake flying paper, and five-level small trees shake with leaves;

It is difficult to walk under the umbrella of level 6, and it is inconvenient to walk in the wind of level 7;

Eight winds blow branches and nine roofs fly tiles;

Ten uprooted trees and fallen houses are rare on land.