Describe tectonic plates and explain how they “float” on the earth’s surface (what do they float on and what causes their movement

The asthenosphere contains materials more dense than those of the tectonic plates lying above, which enables the plates' flotation. The positioning of tectonic plates above the asthenosphere and resulting movement is just one small part of how tectonic plates work. The Earth's crust forms from many other layers of sedimentary deposit, which form above and below the asthenosphere. Above the asthenosphere lies the lithosphere, which occurs in continental and oceanic forms.

The continental variety contains materials of lighter weight than those in the oceanic form. Tectonic plates might form from either substance. Regardless of composition, all plates have the same ability to move via flotation. The movement of tectonic plates varies depending on several factors, including weight and size. Heavier plates, or plates with heavier areas, sink more quickly than lighter ones. Over time, these plates dissolve into the lithosphere. One plate might sink beneath the edge of another, causing a subduction zone. Fluids from moving plates rise to the surface, escaping into surrounding water or air, ultimately producing magma and lava.

sadness is not good

explanation:

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.