104
Bloque I
R
Research project, 10
Rivers, 87
Rocks, 52, 53, 55, 56, 58
Rotation, 30, 31, 36, 34
Ruby, 72
S
Salinity, 86
Sandstone, 55
Sapphire, 51
Satellites, 30
Schist, 56
Scientific laws, 7
Seasons of the year, 35
Sedimentation basins, 54
Sediments, 54
Seismograph, 46
Slate, 56
Solar System, 30
Solstices, 35
Stars, 29
Stratosphere, 69
Streak, 49
Sulphur, 49
Superficial tension, 89
Syenite, 53
T
Tenacity, 50
Texture, 52
Theory, 7
Thermosphere, 69
Tides, 39
black, 95
Time zone, 36
Torrents, 87
Transparency, 50
Troposphere, 69
U
Universal solvent, 89
Universe, 24
Uraninite, 51
W
Water, 86, 89
waste, 95, 97
Weathering, 54
Well, 85
Wetlands, 87
Y
Year, 31
leap, 34
light, 26
Z
Zone,
ablation, 38
saturated, 32
