Directions: Write the word TRUE if the statement is correct and if not, underline the word or statement incorrect and correct answer on the space provided. write
1. All x-ray are dangerous because they can damage healthy living cells of the body.
2. Ultraviolet in sunlight radiation produces vitamin D in the skin and gives us tanning effect
3. Microwaves can penetrate the atmosphere of the earth.
4. Radio wave used to transmit sound and picture information over long distance.
5. Infrared wave also damage cells, causing mutation.
6. Gamma rays is absorbed by water molecules, so it can be used for cooking.
7. Over-exposure to UV radiation may cause skin cancer.
8. Low frequency waves are suitable for communication over great distances.
9. Most EM waves are visible to the eye of humans and animals.
10. Visible light are used by banks to check the signature on a passbook.
Modified True or False.
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It can come from unstable atoms that undergo radioactive decay, or it ... Ionizing radiation can affect the atoms in living things, so it poses a health risk by ... Ionizing radiation comes from x-ray machines, cosmic particles from ... However, as with alpha-emitters, beta-emitters are most hazardous

Explanation:

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion