Because they are in love!

The sky is still blue, so is the sea.

But they can't let love continue.

Because their hands can't hold hands.

This is god's arrangement.

The sky cried and tears fell on the sea.

Even if punished, the sky will send its soul into the sea.

From this time on.

The sea is bluer than the sky.

The sky is blue, because dust, moisture and ozone in the air scatter, which makes the sky blue.

The sea is blue because light cannot penetrate water above 100 meters, so the deep sea is black. When the background is dark, dark color will absorb most of the wavelength of visible light and reflect less light. So when the light is strong, the color is light; Low light intensity and dark color. So it has the effect of blue on sunny days, gray on cloudy days and black at night. Morning glow and sunset glow are the reasons why the incident angle of sunlight is small, which leads to the reflection of light on the water surface into red.