Give three reasons how ionic and covalent bonds are different

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Explanation:

Covalent bonds and ionic bonds are two different ways of how elements bond to each other. The main difference between covalent and ionic bonds is that ionic bonds occur between two species which are electrostatically attracted towards each other, whereas covalent bonds occur covalently through the sharing of electrons between their outer shells.

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Meaning :- When there is a strong electrostatic force of attraction between a cation and an anion (two oppositely charged ions) of elements is called the ionic bond. This bond is formed between a metal and a non-metal.

Involves :-Transfer and accepting of electrons from the valence shell.

Existence :- They also exist in the solid state only.

Examples :- NaCl, BeO, LiF, etc

Meaning :- When there is a strong electrostatic force of attractions between two positively charged nuclei and the shared pair of electrons is called the covalent bond.

Involves :- Sharing of electrons in the valence shell.

Existence:- Exist as solids, liquids and gases.

Examples:- Diamond, carbon, silica, hydrogen gas, water, nitrogen gas, etc.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.