Answer: It formed when lava cooled quickly aboveground.
Explanation: Cause its right
Chemical changes are considered "unseen" because they change the chemical makeup, instead of the overall appearance.
Answer:
Explanation:
When he accelerates the heavy object up , the reading increases because an extra downward normal force acts on it, then scale reading returns to the same reading as when standing stationary, and then decreases as although he is lifting the heavy object , the acceleration is decreasing ,so the extra upward normal force acts.
He identified triads of elements that had similar properties
Answer:
Explanation:
Los átomos que tienen el mismo número de protones y electrones pero diferente número de neutrones se llaman isótopos. Los isótopos de un elemento dado tienen diferentes masas atómicas.
