Volcanoes
Grade 4 · Science · Earth's Changing Surface · New Hampshire, USA
Lesson Summary
A volcano is an opening in Earth's surface where hot melted rock, ash, and gases escape from below.
Explanation
Deep inside Earth, rock gets so hot that it melts into magma. Pressure pushes magma upward through cracks. When it reaches the surface, it is called lava. Over time, layers of hardened lava and ash build up to form a volcano. Some volcanoes erupt explosively, shooting ash high into the sky. Others ooze lava slowly. Volcanoes can create new land, like the Hawaiian Islands, but they can also be very dangerous to nearby communities.
Practice Questions
Q1: What is the difference between magma and lava?
Answer: Magma is melted rock below Earth's surface. Once it reaches the surface, it is called lava.
Q2: How do volcanoes build up over time?
Answer: Layers of hardened lava and ash pile on top of each other after each eruption.
Q3: Name one way volcanoes can create new land.
Answer: Lava flows into the ocean and cools, forming new rock and land, like the Hawaiian Islands.
People Also Ask
What is Volcanoes in Grade 4 Science?+
Volcanoes is a lesson in the Earth's Changing Surface chapter of Grade 4 Science. It is part of the New Hampshire, USA school curriculum and covers key concepts that students need to understand at this level.
What grade level covers Volcanoes?+
Volcanoes is taught in Grade 4 as part of the Science curriculum in New Hampshire, USA.
How can I help my child with Earth's Changing Surface in Science?+
Start with the lesson summary and explanation on this page. Practice the questions provided, then use TutorTom for personalized, step-by-step help with Earth's Changing Surface topics.