science exam

Green house effect

Gases from the earth are in the atmosphere, heating the earth

Green house gases

Methane

Carbon dioxide

TIR

light travelling through a dense medium and reflects back into it

Critical angle

3 situations

Swimming

Denser to rare medium

Perpendicular incident

CR

angle of incidence where the angle of refraction is 90

Breathing

Pressure in the chest muscles and diaphragm

Gas exchange

Body absorbs oxygen - goes into blood stream - releases car on dioxide

Myopia

Distant objects are blurry

In front of retina

Hyperopia

Behind retina

Close items are far away

Ionic

Metal + non metal

Molecular

Only non-metal

Law of conservation

Matter cannot be created or destroyed

Mammogram

X ray of the body

X rays

High energy radiation

Endoscope

Camera on an optic fibre

Xylem

Moves water bottom to top theough hollow fells

Pholem

Moves sugar and nutrients

Through living ces

High albedo

Most is reflected

Liver

Filters toxins and produces bile

Pancreas

Makes insulin

Arteries

Prevents vessels from exploding

Further away from the body

Veins

One way valves

Toward heart

Capillaries

One thick cell

Single file

Gas exchange