The Gulf Coastal Plain of North America runs north from the Gulf of Mexico along the Lower Mississippi River to the Ohio River, a distance of about 500 miles (800km).
Coastal plains are always next to a seacoast.
Object of Preposition
Yes, when using "as needed" as an adverbial phrase in a sentence, you do not need commas unless the phrase interrupts the flow of the sentence. For example, "Medication should be taken as needed for pain relief."
Object of Preposition
Using a gerund at the beginning of a sentence is perfectly acceptable.
No, "of the mountains highlands" is not an adjective phrase. It seems to be a prepositional phrase that describes a location or origin using the preposition "of" and the noun phrase "the mountains highlands." An adjective phrase modifies a noun or pronoun in a sentence, but this phrase functions more like a descriptor of a specific place.
That's two words, you know.The coastal plain borders the ocean.We studied the coastal plain in school.Our town is on the coastal plain.
It's plain to see that you have never used the word plain in a sentence!
Your question is a sentence and contains the phrase "feature article." (The above is another example of using the phrase in a sentence.)
This is one sentence using the phrase 'division of labour.'
Here is my choice out of it. Out of it I chose Italy.
Watch out for that magma!
The plains in South Texas continue into Mexico.
Some parrots can repeat an entire sentence
Looking now to the left, you will see our very lovely coastal plains. Seagulls are coastal flyers. These coastal tide pools are fun to explore during low tide.
Here are three sentences using the word 'coastal': "Brighton is a coastal town." "I would like to live in a coastal town because I like being near the sea." "It is often difficult to get to coastal towns because there is little public transport."
No, it is a subordinated phrase using since.
Airplane pilots "walk on clouds".