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The class could not go outside for recess

it was raining

The food in the refrigerator spoiled

the power went out

The man had heart disease

eating fast food high in fat

Janice got home late

she missed her favorite television program

My father smokes

he suffered from shortness of breath and had trouble climbing stairs or running

My brother is in great physical condition

he eats healty and exercises at least three days a week

There are hundreds of people lined up outside the store

a big sale is goin on today

Lisa did not wear sunblock

her face, neck, and arms are very red

The company's server crashed

their website was unavailable

I like math and pay attention in class

I make good grades in math

Soda and candy are high in sugar

tooth decay

Dumping waste and garbage into the ocean

the coral reef dies

Lack of Vitamin C

unhealthy skin and teeth

Moon's gravitational pull

ocean tides

Acidic gastric juices, which are secreted by the gastric glands in the stomach, help in mixing chewed food and in turning it intoa partial liquid

digestion begins

Food enters the small intestine

absorption takes place

allergies to pollens, dust, or molds

sneezing

Earth orbits the sun elliptically and, at the same time, spins on a tilted axis

seasons

The plates, or layers of the Earth's crust rub together, pull apart, collide or dive under one another

earthquake

Earth rotates or spins toward the east

The Sun, the Moon, the planets, and the stars all rise in the east

updrafts and downdrafts during a thunderstorm mixed accompanied by counter-clockwise air flow

tornado

one egg and one sperm splitting into two

identical twins

the outer layer of skin separates from the inner layers due to friction and the space between fills with lymph fluid

blister

broken bloodvessels beneath the surface of the skin

bruise

rapid expansion of the air surrounding the path of a lightning bolt

thunder

cold, frozen ground and scarce food supply

hibernation

Amber could not see the board

she went to the optometrist and got glasses

The rainforests are being destroyed

many species of wildlife are becoming extinct

Mount St. Helens, an active volcano, erupted in 1980

dust filled the air and it was difficult to breathe

When the volcano erupted, hot lava flowed out

snow snow melted on the mountain causing flooding and landslides

the fans watched quietly in the stands

an injured player lay on the field

Amy left her lunch box in her mom's car

she ate lunch in the cafeteria

stock market crash that occurred on Black Tuesday, October 29, 1929

The Great Depression

Not washing your hands

spreading Colds and flu

Germany's invasion of Poland.

Beginning of World War II

pollution from cars, factories, and electricity production

global warming

UV rays from the sun

skin cancer

Robert's car broke down

he rode the bus to work

Chlorophyl absorbs sunlight and interacts with carbon dioxide and water

green leaves

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