Which statements in this passage about volcanoes do not contain factual errors?
the hawaiian islands are known for their volcanic activities. in fact, the islands were formed from volcanoes.1. before a volcano erupts, earthquake activity beneath the volcano decreases.2. scientists use seismometers to measure the earthquake activity that occurs beneath a volcano. they then predict the eruption of that volcano.3. when a volcano erupts, the amount of carbon dioxide and sulfur dioxide emitted decreases. 4.scientists measure the amount of these gases to determine the amount of magma present in the volcanic reservoir.

The correct answer is option 2. "Scientists use seismometers to measure the earthquake activity that occurs beneath a volcano. They then predict the eruption of that volcano".

Explanation:

A seismometer is an equipment used by scientists to monitor ground's motion, including the earthquake activity that occurs beneath a volcano. These instruments are useful to predict if a volcanic eruption is imminent. By analyzing the length and strength of the ground's motion occurring during earthquake activity near a volcano, scientist could predict if an eruption is about to take place.

allowed for the prediction of the properties of missing elements.

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.