There would be no seasons
we would not have seasons
Earth's axis is tilted to about 11 degrees from the vertical.
Gravity is always acting on the vertical axis, pulling objects downward towards the Earth's center.
Its axis
axis
.
The x axis is the horizontal axis. The y axis is the vertical axis.
The vertical axis is the y-axis. The horizontal axis is the x-axis.
First of all, as long as we're in our comfortable familiar environment, "vertical" means toward or away from the center of the earth. When you start talking about things in space, the word "vertical" has no meaning. You might expect the earth's axis of rotation to be perpendicular to the plane of the earth's orbit around the sun. If that's what you expect, then you'll be disappointed. The axis of rotation makes an angle of about 66.5 degrees with the orbital plane.
The zero on the vertical axis for earthquake depth vs latitude graph indicates that there is no earthquake occurring at the Earth's surface (0 km depth) at the extreme latitude ends (poles). This is due to the way earthquakes are recorded by seismometers, typically located on the Earth's surface. As earthquakes cannot happen at the exact poles, the graph reflects this by showing a zero depth at the top of the vertical axis.
I think the question should be "what is the angle..." The tilt of Earth's axis is about 23.5°. This is the angle between Earth's axis and a line that is vertical to the Ecliptic (the plane in which Earth orbits the Sun).
The y axis is vertical and the x axis is horizontal.