Earth Science TIMSS

Which of the following is the major cause of tides?

• Heating of oceans by the Sun

• Gravitational pull of the moon

• Earthquakes on the ocean floor

• Changes in wind direction

Soils change both through natural processes and as a result of human activity. Which of the following soil changes is due only to natural causes?

• degradation of nutrients due to pesticides

• formation of deserts due to tree felling

• flooding due to dam construction

• removal of nutrients due to heavy rains

Th e following waste materials are buried in a landfill. Which will break down most quickly?

• Steel

• Plastic

• Glass

• Paper

Where are active volcanoes most likely to be found?

• where rivers form

• where tectonic plates meet

• where oceans are deepest

• where land and water meet

Some volcanic rocks have many holes in them

• insects dug into the rock when it was soft

• Gas bubbles were trapped in the rock when it cooled

• Rain dropped on the rock when it was soft .

• Small stones fell out of the rock when it cooled