Question

Tornadoes, also called twisters, are born during a thunderstorm. They are funnels of spinning air that can create winds up to 250 miles per hour. The United States has thousands of tornadoes each year, but a particular hot spot, referred to as Tornado Alley, includes South Dakota, Nebraska, Kansas, Oklahoma, northern Texas, and eastern Colorado. Tornado Alley is where some of the most severe and destructive tornadoes occur.
Tornadoes form when there are changes in a wind's speed and direction resulting in a spinning storm cell. Once rising air starts moving up through a thundercloud, a tornado is born. The spinning funnels are only visible because of large amounts of dust and debris that get sucked up though the center of the funnel. Tornadoes are also characterized by a dark, greenish sky, large hail, and a train-like roar.
Tornadoes often occur during the late afternoon in the spring. The spring moisture and heat seem to create the perfect atmosphere for a twister. Once a twister touches the ground, it may continue to spin for as little as a few seconds or as long as a couple of hours. Most tornadoes do not travel more than six miles before dissipating or breaking apart.
Meteorologists use several extremely helpful tools to predict and detect tornadoes. Tools such as Doppler radar, satellites, weather balloons, and computer modeling help by monitoring the skies and detecting tornado activity. Valiant tornado researchers are continuously risking their lives by racing to place scientific sensors in tornadoes' paths. These sensors collect data that will ultimately lead to better predictions and storm warnings.
10
Based on the context of the passage, what does the word valiant suggest about the researchers?
A.
The researchers are brave because they complete courageous tasks.
B.
The researchers are excited because they use Doppler radar.
C.
The researchers are frustrated because tornadoes cause damage.
D.
The researchers are worried because tornadoes are dangerous.

Answer 1

A. The researchers are brave because they complete courageous tasks.