First of all, are you a child asking this simple question?
If not, and you are an adult, maybe you were sleeping in elementary class at the back row =)
If you are, I will gladly answer your question.
Airplanes usually have jet engines that produce hot air as by-products of burning jet fuel. The jet propulsion system pushing the airplane forward leaves a trail of hot air. When hot air comes in contact with cold air, it produces air droplets. These droplets is what we see as white streaks in the sky trailing an airplane...
An example is when you blow your breath to the cold winter air and you can see steam...
Gypsum streaks typically appear as thin white or light gray streaks on surfaces such as walls or ceilings. These streaks can be caused by water seepage or moisture, which results in the gypsum material absorbing and spreading throughout the surface. To address gypsum streaks, it is important to first identify and fix the source of the moisture to prevent further streaking and damage. Cleaning the affected area with a mild detergent solution and allowing it to dry thoroughly can help remove existing streaks.
Cirrus clouds are thin and wispy in appearance, with a feather-like or fibrous structure. They are often described as looking like streaks or wisps of white in the sky, resembling mare's tails or fish scales.
Rain that evaporates before it hits the ground is called virga. It appears as streaks or wisps of precipitation in the sky but dissipates before reaching the surface due to evaporation.
Solid white flakes of water that fall from the sky are known as snow. Snow forms when water vapor in the atmosphere freezes into ice crystals and falls to the ground.
The metaphor "the white clouds were cotton candy in the sky" suggests that the clouds were fluffy and reminiscent of the sweet, airy texture of cotton candy. It creates a vivid image of lightness and softness in the sky.
white
Cirrus (Ci): The ice-crystal cloud is a feathery white cloud that is the highest in the sky. It has a wispy looking tail that streaks across the sky and is called a fallstreak. - Kidzworld dot com
Some possible rocks that can have white streaks include quartz, marble, and gypsum. White streaks can also be found in other minerals and rocks that contain light-colored minerals such as feldspar or calcite. The presence of white streaks in a rock can be indicative of certain mineral compositions.
We don't no
Most commonly it's when your skin loses pigment. It causes white streaks that usually stay for life.
The red and pink streaks in a white russet potato are likely caused by stress during growth, such as exposure to sunlight or temperature fluctuations. These streaks are natural and do not affect the taste or quality of the potato.
Chlorine
white with green streaks
NORTHAN LIGHTS
Blue streaks in the sky resembling blue rainbows can be caused by a phenomenon called cloud iridescence. This occurs when water droplets or ice crystals in the atmosphere scatter sunlight or moonlight, creating the appearance of colorful streaks or bands. The blue color may be due to the scattering of light by smaller water droplets.
Sometimes when the sky and storm are many in the sky, the sky will look a kind of white.
It is a soft, grayish stone, usually with white streaks.