Test Yourself. Иванова Ю.В - 35 стр.

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(4)__________? Millions of years ago, solid layers of ice (5) __________
the lakes and hills of Europe and North America. (6) __________ formed
the bare faces of the Alps. Water froze and (7) __________ in the cracks of
big rocks and broke them down into smaller ones.
Text В
stored pressure transmitted gradually vital fractional
concentrates liquid structure evaporates
Oxygen is (1) __________ to life; it is needed by the body cells of all
animals. It is also very useful in industry. It is produced in the following
way. Air is put into containers under great (2)__________. This turns it into
(3) __________ and makes it very cold. It is then (4) __________ warmed
up and each substance (5)__________ at a different temperature. The
boiling point of oxygen is – 183
0
C. It is caught and (6)__________ in
strong steel cylinders at a pressure of 136 atmospheres. The process is
known as (7) __________ distillation.
Text С
unique heat turbine steam expansion jet propulsion
rotates source evaporates
A simple (1) __________ engine was built by a Greek scientist, Hero of
Alexandria, about 2,000 years ago. So the principle of jet (2) __________ is
not a new one! Hero knew that water (3) __________ and expands when it
is heated. One cubic centimeter of water produces about twelve cubic
centimeters of (4)__________. When water changes into steam, the (5)
__________ gives energy to the water molecules. They move in all
directions, thus causing (6)__________. This is why compressed steam is a
valuable (7) __________ of energy.
Text D
signals telescopes orbits increased artificial solar
measure attracted sources transmitted
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