Question

use the text to compare and contrast uvb rays and uva rays.
two kinds of radiation make up the light from the sun that penetrates the atmosphere and reaches earth: long wave ultraviolet a (uva) and short wave ultraviolet b (uvb). though uvb rays tend to damage the skins outer layers, causing redness and sunburn, uva rays penetrate the skins thickest layer, known as the dermis. it was once thought that only uvb rays were cause for concern. over the years, however, scientists have learned more about how uva rays damage skin cells in the basal layer, where a majority of skin cancers form. now we know that uva rays pose dangers similar to those from uvb rays in terms of skin cancer development. in addition, both types of rays contribute to the premature aging of skin.

	uvb rays	uva rays
penetrate the dermis
play a role in skin cancers
play a role in skin aging

Explanation:

To solve this, we analyze the text and fill the table:

Step 1: Penetrate the atmosphere

From the text: "Two kinds of radiation make up the light from the sun that penetrates the atmosphere and reaches Earth: long wave ultraviolet A (UVA) and short wave ultraviolet B (UVB)". So both UVB and UVA rays penetrate the atmosphere.

Step 2: Penetrate the dermis

Text: "UVA rays penetrate the skin's thickest layer, known as the dermis" and "UVB rays tend to damage the skin's outer layers". So only UVA rays penetrate the dermis.

Step 3: Play a role in skin cancers

Text: "Now we know that UVA rays pose dangers similar to those from UVB rays in terms of skin cancer development". So both play a role.

Step 4: Play a role in skin aging

Text: "both types of rays contribute to the premature aging of skin". So both play a role.

	UVB rays	UVA rays
Penetrate the dermis	No	Yes
Play a role in skin cancers	Yes	Yes
Play a role in skin aging	Yes	Yes

(If you need a different format or have more questions, let me know!)

Answer:

To solve this, we analyze the text and fill the table:

Step 1: Penetrate the atmosphere

From the text: "Two kinds of radiation make up the light from the sun that penetrates the atmosphere and reaches Earth: long wave ultraviolet A (UVA) and short wave ultraviolet B (UVB)". So both UVB and UVA rays penetrate the atmosphere.

Step 2: Penetrate the dermis

Text: "UVA rays penetrate the skin's thickest layer, known as the dermis" and "UVB rays tend to damage the skin's outer layers". So only UVA rays penetrate the dermis.

Step 3: Play a role in skin cancers

Text: "Now we know that UVA rays pose dangers similar to those from UVB rays in terms of skin cancer development". So both play a role.

Step 4: Play a role in skin aging

Text: "both types of rays contribute to the premature aging of skin". So both play a role.

	UVB rays	UVA rays
Penetrate the dermis	No	Yes
Play a role in skin cancers	Yes	Yes
Play a role in skin aging	Yes	Yes

(If you need a different format or have more questions, let me know!)