There are two clauses here, making this a compound sentence.
Clause 1 = Plenty of silicon is found on Earth
Clause 2 = it remains a valuable material for the computer industry.
Now can you see the simple subject and simple verb in each clause?
??
In the sentence - Plenty of silicon is found on Earth, but it remains a valuable material for the computer industry. What is the simple subject and predicate?
2 answers
yes, but I'm not sure if the simple predicate in clause 1 is is or is found.