Answer:
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Rock Mineral
Explanation:
Rock minerals are naturally occurring inorganic solids with a definite chemical composition and an orderly arrangement of atoms.
Minerals forms as a result of combination of different elements.
The minerals makes up rocks. A rock is an aggregate of minerals.
- They are naturally occurring: minerals are not formed in the laboratory through a synthetic process.
- The are inorganic: not formed by living organisms.
- Solids: minerals are in the solid phase of matter
- definite chemical composition: they are compounds and not mixtures.
- Orderly arrangement of atoms: they are crystalline
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Dugesia possess a central tubular digestive tract and this has three branches. These branches consist of ceca, which deliver nutrients to the body.
Answer:
Atmosphere layers. Earth's atmosphere is divided into five main layers: the exosphere, the thermosphere, the mesosphere, the stratosphere and the troposphere. The atmosphere thins out in each higher layer until the gases dissipate in space.
Explanation:
The atmosphere has 4 layers: the troposphere that we live in near the surface of the earth; the stratosphere that houses the ozone layer; the mesosphere, a colder and lower density layer with about 0.1% of the atmosphere; and the thermosphere, the top layer, where the air is hot but very thin.
