Answer:
because the stress is on the second syllable of the base word ending in consonant + vowel + consonant
Explanation:
If a multiple-syllable word ends in a single consonant preceded by a single vowel and the accent is on the last syllable of the root word, double the final consonant before a suffix beginning with a vowel.
e.g. refer – referred, occur – occurrence, commit – committal, rebel – rebellion.
It is 4. because it says in the paragraph and I quote: "helium has a very low density. it is used in daily weather balloons to carry instruments that record, tempature, humidy, and pressure readings in the atmosphere.
Answer:
studies show that solar variability has played a role in past climate changes. For example, a decrease in solar activity is thought to have triggered the Little Ice Age between approximately 1650 and 1850, when Greenland was largely cut off by ice from 1410 to the 1720s and glaciers advanced in the Alps.
Explanation:https://climate.nasa.gov/causes/
