36. A tornado is a violently rotating column of air that extends from a thunderstorm to the ground and is often - though not always - visible as a funnel cloud. (Câu đầu tiên)

37. Lightning and hail are common in thunderstorms that produce tornadoes. (Dòng 2)

38. Related thunderstorms can cause heavy rains, flash flooding, and hail. (Câu cuối đoạn 1)

39. About 1200 tornadoes hit the United States every year. (Câu đầu đoạn 2)

40. Tornadoes can strike in any season, but occur most often in the spring and summer months. (Câu đầu đoạn 3)

`36.` A tornado is a violently rotating column of air that extends from a thunderstorm to the ground and is often - although not always - visible as a funnel cloud.

`=>` Thông tin đoạn `1`

`=>` Dẫn chứng: A tornado is a violently rotating column of air that extends from a thunderstorm to the ground and is often - although not always - visible as a funnel cloud. 

`37.` Lightning and hail are common in thunderstorms that produce tornadoes.

`=>` Thông tin đoạn `2`

`=>` Dẫn chứng: Lightning and hail are common in thunderstorms that produce tornadoes.

`38.` Related thunderstorms  can cause heavy rains, flash flooding, and hail 

`=>` Thông tin đoạn `4`

`=>` Dẫn chứng: Related thunderstorms can cause heavy rains, flash flooding, and hail.

`39.`  About 1,200 tornadoes hit the United States every year

`=>` Thông tin đoạn `5`

`=>` Dẫn chứng: About 1,200 tornadoes hit the United States every year and every state is at risk. 

`40.`  Tornadoes can strike in any season but occur most often in the spring and summer months 

`=>` Thông tin đoạn `6`

`=>` Dẫn chứng: Tornadoes can strike in any season, but occur most often in the spring and summer months.