7th Grade Topic 3 Test

The rock that forms Earth's outer layer: ___________________________

• The rock that forms Earth's outer layer is called the crust.

• The rock that forms Earth's outer layer is called the mantle.

• The rock that forms Earth's outer layer is called the core.

• The rock that forms Earth's outer layer is called the lithosphere.

The strong, hard and rigid layer of Earth's crust and upper mantle: ___________________________

• Lithosphere

• Asthenosphere

• Mesosphere

• Biosphere

The layer of hot rock beneath the crust, and it extends down to Earth's core: ___________________________

• mantle

• crust

• outer core

• inner core

The layer of molten metal surrounding the inner core. It is liquid and has high pressure: ___________________________

• Outer core

• Mantle

• Crust

• Lithosphere

The layer of earth that is the dense ball of solid metal:

• Inner Core

• Mantle

• Crust

• Outer Core

Scientists believe that Earth's magnetic field is caused by:

• The movement of tectonic plates

• The rotation of the Earth

• The flow of molten iron in the Earth's outer core

• The gravitational pull of the moon

What 3 processes or forces combine to set convective currents in motion?

• 1. Heating and cooling of the fluid 2. Changes in the fluid's density 3. Gravity

• 1. Magnetic fields 2. Wind patterns 3. Ocean currents

• 1. Earth's rotation 2. Solar radiation 3. Tidal forces

• 1. Chemical reactions 2. Sound waves 3. Light absorption

What are convection currents in Earth?

• The movement of tectonic plates due to heat from the Earth's core.

• The flow of water in the ocean caused by wind.

• The rotation of the Earth on its axis.

• The cycle of evaporation and precipitation in the atmosphere.

What 5 characteristics define minerals?

• 1. Naturally occurring 2. Inorganic 3. Solid 4. Definite chemical composition 5. Ordered internal structure

• 1. Organic 2. Liquid 3. Variable chemical composition 4. Random internal structure 5. Man-made

• 1. Naturally occurring 2. Organic 3. Gaseous 4. Definite chemical composition 5. Ordered internal structure

• 1. Inorganic 2. Liquid 3. Definite chemical composition 4. Random internal structure 5. Man-made

Luster: __________________________

• Shiny appearance

• Dull surface

• Rough texture

• Matte finish