4) what is an unconformity? where can you find one in the grand canyon? what types of rocks contact at the "great unconformity," and about how old is each type of rock? what does the missing time between the two rock formations mostly likely represent? explain in 3-5 sentences

a surface of contact between two groups of unconformable strata.

"erosion beneath the Hercynian unconformity has removed most of the Westphalian strata"

the condition of being unconformable.

Explanation:

Seen from Desert Tower, the Great Unconformity is the boundary between the flat-lying Tapeats sandstone (and overlying Paleozoic rocks) and tilted rocks of the Grand Canyon Supergroup (GCS).

thats all I know so i hope this helps

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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the answer would be a