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6. By referencing the vertical datum, officials are determining
now the true elevation and position of the hurricane and evacuation
routes.
7. Round brass plates can mark positions in the vertical datum.

8. Surveyors marked each of the positions with a brass bronze
disk.

Task 2. Write down the correct article (a, the, -) in the
sentences and explain its usage. Think of some other examples

of the article usage.
1. The development of ___ Cartesian coordinate system would

play ___ important role in the development of __ calculus by ___
Isaac Newton and ___ Gottfried Leibniz.
2. In 1884 ___ US hosted ___ International Meridian Conference

and twenty-five nations attended.
3. ___ Dominican Republic voted against the adoption of the
location of ___ Greenwich as ___ zero-reference line while ___
France and ___ Brazil abstained.

4. ___ Earth is not static, as points move relative to each other
due to continental plate motion, subsidence and diurnal movement

caused by ___ Moon and ___ Sun.
5. OSGB 36 is ___ better approximation to the geoid covering
___ British Isles then ___ global WGS 84 ellipsoid.
6. Ellipsoidal height refers to a geometric approximation of ___

Earth called ___ ellipsoid.
7. ___ early Greaks measured locations on ___ Earth’s surface
relative to ___ Sun or Stars.
st
8. Since ___ 1 January 1999 ___ official coordinate system for
___ South Africa is based on ___ WG system 1984 ellipsoid.

Task 3. Fill in the table with the missing related words. The
first word is done for you. In case of doubt which derivative to
use look the words up in the dictionary.

NOUN ADJECTIVE VERB

reason reasonable to reason
description
definite to define

applicability
adoption to adopt

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