Which of the items below is electromagnetic radiation?

What is the wavelength of the shortest wavelength light visible to the human eye?

At the time of the winter solstice (the start of winter) the sunlight is at a lower angle and thus is ____ than(as) in the start of summer in the northern hemisphere.

If you see the stars and constellations rotating around a point in the night sky in the clockwise direction, you are looking north.

You are located at 40 degrees south latitude on Earth and the northern hemisphere is experiencing winter. Days for you are short whereas nights for you are long.

Sit on the floor with your legs straight out, raise your straight arm out with your thumb up such that your thumb aligns with one of your big toes, rapidly blink your left and right eye, and observe how your big toe appears to shift positions. This demonstration is an example of _________________.

Ocean high tides occur on the far side of Earth because the moon pulls more on the land of Earth than on the ocean.

The observed amount of difference between the perihelion of Earth in early January and aphelion in early July results in the northern hemisphere being _____.

The orbit of Mercury is circular.

The ____ Moon is visible above the eastern horizon a couple of hours before sunrise.