Geotectonics

Basic lava erupts out of volcano, throwing out mainly –

• CO
• dust
• ash
• all of the above

Volcanoes that haven’t erupted in historic times are known as –

Volcanoes that erupt frequently are known as –

Magma which is forced onto Earth’s surface is known as –

• Lava
• Vent
• Cone
• None of the above

Volcanoes that have erupted in historic times and are still likely to erupt, are known as –

Top of magma is forced onto Earth’s surface is known as –

Fluidity of lava is determined by amount of –

Layers of volcanic materials that build up around vent to form a cone-shaped structure are known as –

• Crater
• Vent
• Cone
• None of the above

A hole in Earth’s crust through which magma comes to Earth’s surface is known as –

Eruptions of composite volcanoes are loud and violent because that contain –

• basic lava
• viscous composite lava
• viscous acid lava
• none of the above

Passageway which joins vent to crater of volcano is known as –

Acid lava flows slowly as it is highly –

• dense
• viscous
• sensitive
• all of the above

Eruptions from composite volcanoes are usually –

This is the scale used to measure the size of volcanic eruptions –

• Richter Scale
• Volcanic Explosivity Index
• Volcano Eruptivity Scale
• None of the above

The Earth while rotates around the Sun It always keeps its axis pointed towards :

Total surface area of the earth in square kilometer is :

In which situation Spring tides can occur :

Mohs scale is used to determine :

In which direction the Earth rotates around its axis ?

What is the circumference of the Earth in kilometers ?