[ Vocabulary ]
What is the the principle that in undisturbed rock layers, the oldest rocks are on the bottom?
A. tilt
B. principle of superposition
C. uplifting
D. principle of horizontality

Random Topics:
Singular and Plural NounsAsking and Giving OpinionComparativeAdjective vs AdverbLinking Verbs & Helping VerbsTypes of Sentence StructureFrequencyAdverbGrammar Comma UsageActive vs. Passive VoiceOther quiz:
Grammar and Passive Voice › ViewWhich sentence uses the passive voice correctly?
A. The letter was written by Sarah.
B. Sarah was writing the letter.
C. Sarah writes the letter.
D. The letter writes Sarah.
Future Tense › View
I’m afraid you ____ lose your job if you don’t work harder.
A. will
B. are going to
C. will be
D. will have
Past Continuous vs Past Simple › ViewWhat word is missing? NEGATIVE: She ____________ talking to her mom, she was talking to her dad.
A. Didn’t
B. Weren’t
C. Hadn’t
D. Wasn’t
Vocabulary › View
We’re going on a guided _________ of the historical landmarks in the city.
A. tourist attractions
B. sound
C. tour
D. continent
