A student replaces the switch in an electric circuit with an object. A light bulb in the circuit does not light up. What can the student conclude about
the object?
O It is too large.
O It is an insulator
It is a conductor.
It is made of metal.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa