Because it doesn't emit light.
Everything in the universe, which has mass, is the source of gravity. Mass is the fundamental property of every object in this universe and it is due to this property that every object attracts other objects. So, earth is also a source of gravity.
Yes, the sun is the primary natural light source for Earth.
The primary is the sun
The sun is the main source of energy on earth.
No, the Earth is not a source of light itself. The Earth's primary source of light is the Sun, which emits light and energy that reaches the Earth and illuminates it. The Earth reflects some of this light, which is why we can see it.
The heat source within the early Earth was primarily from the process of planetary accretion, where gravitational energy from colliding particles and the compression of material as the Earth formed generated heat. Radioactive decay of elements like uranium, thorium, and potassium also contributed to the heat within the Earth's interior.
the sun is the main source of energy of the earth the sun is the main source of energy of the earth the sun is the main source of energy of the earth
As seen from the moon, the Earth is a brighter source of light than the moon is as seen from the Earth. This also depends upon the phase of the Earth, just as the brightness of the moon varies by phase. A full moon and a full Earth are in the brightest phase.
This is true, and also for heating the earth's surface and the oceans. The only other source is the heat from the centre of the earth. Man-made activities are small by comparison.
Sunlight is the main energy source for life on earth.
Mass is the source of Earth's gravity. Any object that has mass has gravity.
rotation