Earth is a single sphere, though not quite perfectly round in shape. Therefore, I assume that the 'spheres overlap' in the question is more about tectonic plates - which indeed overlap at their edges. If I'm wrong, then the question needs more information.
You probably mean "oblate spheroid," which is the 3D analogue of an ellipse. The earth and other planets, due to the competition between rotational momentum and gravity, is an oblate spheroid. You can model an oblate spheroid by rotating an ellipse around its shorter axis, just as you can model a sphere by the rotation of a circle around any diameter.
A hemisphere is one half of the sphere that makes up Earth's surface.
NOTHING!
The atmosphere interacts with all living things because it contains oxygen. The lithosphere contains rocks and minerals which are helpful for building materials for various things. The hydrosphere interacts with all the other spheres providing water and nutrients for all living things, and also helps wash and clean other things. All of the above comprise the biosphere. The biosphere interacts with all the other spheres as well (especially the human race) because everything people or animals do affects the air, water or land.
no
The hydrosphere overlaps with the geosphere, biosphere, and atmosphere. Water in the hydrosphere interacts with the land in the geosphere, supports life in the biosphere, and exchanges gases with the atmosphere.
Lithosphere, Hydrosphere, Atmosphere, Biosphere
The four spheres (lithosphere, hydrosphere, atmosphere, and biosphere) do not represent specific elements but rather components of the Earth system. While oxygen is the most abundant element in the Earth's crust, it is not specific to any particular sphere.
A part of the hydrosphere is any body of water.
Tornadoes primarily impact the atmosphere and lithosphere by causing destruction and changes in weather patterns. While they can lead to flooding and affect water bodies, their direct effect on the hydrosphere is minimal compared to other natural disasters like hurricanes.
No a sphere doesn't even have any angles
any two points on the sphere ;)
Any view of a sphere will be a circle.
Because the thread overlap each other.
A sphere does NOT have any edges
Oceans are part of the hydrosphere. The hydrosphere is all the water on Earth at any given moment.
Sphere