<span>between the Tigris and Euphrates rivers.......</span>
Dark Matter only: detected through its gravitational attraction, has mass, most common form of mass in the halo of the Milky Way Galaxy, likely to consist of subatomic particles
Dark Energy only: inferred to exist from the measured acceleration of the universe's expansion, the proposed source of a universal repulsive force
BOTH: the universe contains more of this than it contains matter made from atoms, we do not know what it is made of
NEITHER: blocks light from stars behind it, "dark" because it emits only infrared light
The plate-driving force is the slow movement of hot, softened mantle that lies below the rigid plates."
It's the mantle.
Decomposition<span> is the </span>process<span> by which organic substances are broken down into a simpler matter. The </span>process<span> is a part of the nutrient cycle and is essential for recycling the finite matter that occupies physical space in the biosphere. Bodies of living organisms begin to </span>decompose<span> shortly after death.</span>
